--- /dev/null
+Forwarded: https://github.com/rust-lang/rust/pull/77413
+Bug: https://github.com/rust-lang/rust/issues/79799
+commit a311e14b9cb23419b6a287d651de7d02136a4be4
+Author: Ximin Luo <infinity0@pwned.gg>
+Date: Thu Oct 1 18:53:49 2020 +0100
+
+ Ignore mir tests on big-endian
+
+--- a/src/test/mir-opt/const_prop/checked_add.rs
++++ b/src/test/mir-opt/const_prop/checked_add.rs
+@@ -1,5 +1,5 @@
+ // compile-flags: -C overflow-checks=on
+-
++// ignore-endian-big
+ // EMIT_MIR checked_add.main.ConstProp.diff
+ fn main() {
+ let x: u32 = 1 + 1;
+--- a/src/test/mir-opt/const_prop/mutable_variable_aggregate.rs
++++ b/src/test/mir-opt/const_prop/mutable_variable_aggregate.rs
+@@ -1,5 +1,5 @@
+ // compile-flags: -O
+-
++// ignore-endian-big
+ // EMIT_MIR mutable_variable_aggregate.main.ConstProp.diff
+ fn main() {
+ let mut x = (42, 43);
+--- a/src/test/mir-opt/const_prop/mutable_variable_no_prop.rs
++++ b/src/test/mir-opt/const_prop/mutable_variable_no_prop.rs
+@@ -1,5 +1,5 @@
+ // compile-flags: -O
+-
++// ignore-endian-big
+ static mut STATIC: u32 = 42;
+
+ // EMIT_MIR mutable_variable_no_prop.main.ConstProp.diff
+--- a/src/test/mir-opt/const_prop/optimizes_into_variable.rs
++++ b/src/test/mir-opt/const_prop/optimizes_into_variable.rs
+@@ -1,5 +1,5 @@
+ // compile-flags: -C overflow-checks=on
+-
++// ignore-endian-big
+ struct Point {
+ x: u32,
+ y: u32,
+--- a/src/test/mir-opt/const_prop/return_place.rs
++++ b/src/test/mir-opt/const_prop/return_place.rs
+@@ -1,5 +1,5 @@
+ // compile-flags: -C overflow-checks=on
+-
++// ignore-endian-big
+ // EMIT_MIR return_place.add.ConstProp.diff
+ // EMIT_MIR return_place.add.PreCodegen.before.mir
+ fn add() -> u32 {
+--- a/src/test/mir-opt/const_prop/tuple_literal_propagation.main.ConstProp.diff
++++ b/src/test/mir-opt/const_prop/tuple_literal_propagation.main.ConstProp.diff
+@@ -2,37 +2,37 @@
+ + // MIR for `main` after ConstProp
+
+ fn main() -> () {
+- let mut _0: (); // return place in scope 0 at $DIR/tuple_literal_propagation.rs:2:11: 2:11
+- let _1: (u32, u32); // in scope 0 at $DIR/tuple_literal_propagation.rs:3:9: 3:10
+- let _2: (); // in scope 0 at $DIR/tuple_literal_propagation.rs:5:5: 5:15
+- let mut _3: (u32, u32); // in scope 0 at $DIR/tuple_literal_propagation.rs:5:13: 5:14
++ let mut _0: (); // return place in scope 0 at $DIR/tuple_literal_propagation.rs:3:11: 3:11
++ let _1: (u32, u32); // in scope 0 at $DIR/tuple_literal_propagation.rs:4:9: 4:10
++ let _2: (); // in scope 0 at $DIR/tuple_literal_propagation.rs:6:5: 6:15
++ let mut _3: (u32, u32); // in scope 0 at $DIR/tuple_literal_propagation.rs:6:13: 6:14
+ scope 1 {
+- debug x => _1; // in scope 1 at $DIR/tuple_literal_propagation.rs:3:9: 3:10
++ debug x => _1; // in scope 1 at $DIR/tuple_literal_propagation.rs:4:9: 4:10
+ }
+
+ bb0: {
+- StorageLive(_1); // scope 0 at $DIR/tuple_literal_propagation.rs:3:9: 3:10
+- (_1.0: u32) = const 1_u32; // scope 0 at $DIR/tuple_literal_propagation.rs:3:13: 3:19
+- (_1.1: u32) = const 2_u32; // scope 0 at $DIR/tuple_literal_propagation.rs:3:13: 3:19
+- StorageLive(_2); // scope 1 at $DIR/tuple_literal_propagation.rs:5:5: 5:15
+- StorageLive(_3); // scope 1 at $DIR/tuple_literal_propagation.rs:5:13: 5:14
+-- _3 = _1; // scope 1 at $DIR/tuple_literal_propagation.rs:5:13: 5:14
+-+ _3 = const (1_u32, 2_u32); // scope 1 at $DIR/tuple_literal_propagation.rs:5:13: 5:14
++ StorageLive(_1); // scope 0 at $DIR/tuple_literal_propagation.rs:4:9: 4:10
++ (_1.0: u32) = const 1_u32; // scope 0 at $DIR/tuple_literal_propagation.rs:4:13: 4:19
++ (_1.1: u32) = const 2_u32; // scope 0 at $DIR/tuple_literal_propagation.rs:4:13: 4:19
++ StorageLive(_2); // scope 1 at $DIR/tuple_literal_propagation.rs:6:5: 6:15
++ StorageLive(_3); // scope 1 at $DIR/tuple_literal_propagation.rs:6:13: 6:14
++- _3 = _1; // scope 1 at $DIR/tuple_literal_propagation.rs:6:13: 6:14
+++ _3 = const (1_u32, 2_u32); // scope 1 at $DIR/tuple_literal_propagation.rs:6:13: 6:14
+ + // mir::Constant
+-+ // + span: $DIR/tuple_literal_propagation.rs:5:13: 5:14
+++ // + span: $DIR/tuple_literal_propagation.rs:6:13: 6:14
+ + // + literal: Const { ty: (u32, u32), val: Value(ByRef { alloc: Allocation { bytes: [1, 0, 0, 0, 2, 0, 0, 0], relocations: Relocations(SortedMap { data: [] }), init_mask: InitMask { blocks: [255], len: Size { raw: 8 } }, size: Size { raw: 8 }, align: Align { pow2: 2 }, mutability: Not, extra: () }, offset: Size { raw: 0 } }) }
+- _2 = consume(move _3) -> bb1; // scope 1 at $DIR/tuple_literal_propagation.rs:5:5: 5:15
++ _2 = consume(move _3) -> bb1; // scope 1 at $DIR/tuple_literal_propagation.rs:6:5: 6:15
+ // mir::Constant
+- // + span: $DIR/tuple_literal_propagation.rs:5:5: 5:12
++ // + span: $DIR/tuple_literal_propagation.rs:6:5: 6:12
+ // + literal: Const { ty: fn((u32, u32)) {consume}, val: Value(Scalar(<ZST>)) }
+ }
+
+ bb1: {
+- StorageDead(_3); // scope 1 at $DIR/tuple_literal_propagation.rs:5:14: 5:15
+- StorageDead(_2); // scope 1 at $DIR/tuple_literal_propagation.rs:5:15: 5:16
+- _0 = const (); // scope 0 at $DIR/tuple_literal_propagation.rs:2:11: 6:2
+- StorageDead(_1); // scope 0 at $DIR/tuple_literal_propagation.rs:6:1: 6:2
+- return; // scope 0 at $DIR/tuple_literal_propagation.rs:6:2: 6:2
++ StorageDead(_3); // scope 1 at $DIR/tuple_literal_propagation.rs:6:14: 6:15
++ StorageDead(_2); // scope 1 at $DIR/tuple_literal_propagation.rs:6:15: 6:16
++ _0 = const (); // scope 0 at $DIR/tuple_literal_propagation.rs:3:11: 7:2
++ StorageDead(_1); // scope 0 at $DIR/tuple_literal_propagation.rs:7:1: 7:2
++ return; // scope 0 at $DIR/tuple_literal_propagation.rs:7:2: 7:2
+ }
+ }
+
+--- a/src/test/mir-opt/const_prop/tuple_literal_propagation.rs
++++ b/src/test/mir-opt/const_prop/tuple_literal_propagation.rs
+@@ -1,3 +1,4 @@
++// ignore-endian-big
+ // EMIT_MIR tuple_literal_propagation.main.ConstProp.diff
+ fn main() {
+ let x = (1, 2);