Imported Upstream version 5.18.0.179

Former-commit-id: 67aa10e65b237e1c4537630979ee99ebe1374215

external/llvm/test/CodeGen/MIR/X86/undefined-stack-object.mir

@@ -0,0 +1,29 @@
+# RUN: not llc -march=x86-64 -run-pass none -o /dev/null %s 2>&1 | FileCheck %s
+--- |
+
+  define i32 @test(i32 %a) {
+  entry:
+    %b = alloca i32
+    store i32 %a, i32* %b
+    %c = load i32, i32* %b
+    ret i32 %c
+  }
+
+...
+---
+name:            test
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: gr32 }
+frameInfo:
+  maxAlignment:  4
+stack:
+  - { id: 0, name: b, size: 4, alignment: 4 }
+body: |
+  bb.0.entry:
+    %0 = COPY %edi
+    ; CHECK: [[@LINE+1]]:13: use of undefined stack object '%stack.2'
+    MOV32mr %stack.2, 1, _, 0, _, %0
+    %eax = COPY %0
+    RETQ %eax
+...