Ignore a couple mir-opt tests on big endian

Author: cuviper

src/test/mir-opt/const_prop/mutable_variable_no_prop.main.ConstProp.diff

@@ -25,7 +25,7 @@
           StorageLive(_4);                 // scope 2 at $DIR/mutable_variable_no_prop.rs:+3:13: +3:19
           _4 = const {alloc1: *mut u32};   // scope 2 at $DIR/mutable_variable_no_prop.rs:+3:13: +3:19
                                            // mir::Constant
-                                           // + span: $DIR/mutable_variable_no_prop.rs:10:13: 10:19
+                                           // + span: $DIR/mutable_variable_no_prop.rs:11:13: 11:19
                                            // + literal: Const { ty: *mut u32, val: Value(Scalar(alloc1)) }
           _3 = (*_4);                      // scope 2 at $DIR/mutable_variable_no_prop.rs:+3:13: +3:19
           _1 = move _3;                    // scope 2 at $DIR/mutable_variable_no_prop.rs:+3:9: +3:19

src/test/mir-opt/const_prop/mutable_variable_no_prop.rs

@@ -1,5 +1,6 @@
 // unit-test
 // compile-flags: -O
+// ignore-endian-big
 
 static mut STATIC: u32 = 42;
 

src/test/mir-opt/issues/issue-75439.rs

@@ -1,4 +1,5 @@
 // EMIT_MIR issue_75439.foo.MatchBranchSimplification.diff
+// ignore-endian-big
 
 use std::mem::transmute;
 

src/test/mir-opt/issues/issue_75439.foo.MatchBranchSimplification.diff

@@ -26,7 +26,7 @@
           _3 = _1;                         // scope 2 at $DIR/issue-75439.rs:+2:47: +2:52
           _2 = transmute::<[u8; 16], [u32; 4]>(move _3) -> bb1; // scope 2 at $DIR/issue-75439.rs:+2:37: +2:53
                                            // mir::Constant
-                                           // + span: $DIR/issue-75439.rs:7:37: 7:46
+                                           // + span: $DIR/issue-75439.rs:8:37: 8:46
                                            // + literal: Const { ty: unsafe extern "rust-intrinsic" fn([u8; 16]) -> [u32; 4] {transmute::<[u8; 16], [u32; 4]>}, val: Value(<ZST>) }
       }
 
@@ -49,7 +49,7 @@
           _6 = _4;                         // scope 4 at $DIR/issue-75439.rs:+5:33: +5:35
           _5 = transmute::<u32, [u8; 4]>(move _6) -> bb7; // scope 4 at $DIR/issue-75439.rs:+5:23: +5:36
                                            // mir::Constant
-                                           // + span: $DIR/issue-75439.rs:10:23: 10:32
+                                           // + span: $DIR/issue-75439.rs:11:23: 11:32
                                            // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(u32) -> [u8; 4] {transmute::<u32, [u8; 4]>}, val: Value(<ZST>) }
       }