[llvm] Allow this test to pass when the source is on a read-only filesystem (PR #134179)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-amdgpu

Author: None (Sterling-Augustine)

<details>
<summary>Changes</summary>

llc attempts to create an empty file in the current directory, but it can't do that on a read-only file system. Send that empty-output to stdout, which prevents this failure.

---
Full diff: https://github.com/llvm/llvm-project/pull/134179.diff


1 Files Affected:

- (modified) llvm/test/CodeGen/AMDGPU/llvm.amdgcn.global.load.lds.err.ll (+4-4) 


``````````diff
diff --git a/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.global.load.lds.err.ll b/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.global.load.lds.err.ll
index 383f6c1288d13..f04c7ec9884bd 100644
--- a/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.global.load.lds.err.ll
+++ b/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.global.load.lds.err.ll
@@ -1,7 +1,7 @@
-; RUN: not --crash llc -mtriple=amdgcn -mcpu=gfx810 %s 2>&1 | FileCheck --ignore-case %s
-; RUN: not --crash llc -global-isel -mtriple=amdgcn -mcpu=gfx810 %s 2>&1 | FileCheck --ignore-case %s
-; RUN: not --crash llc -mtriple=amdgcn -mcpu=gfx1100 %s 2>&1 | FileCheck --ignore-case %s
-; RUN: not --crash llc -global-isel -mtriple=amdgcn -mcpu=gfx1100 %s 2>&1 | FileCheck --ignore-case %s
+; RUN: not --crash llc -o - -mtriple=amdgcn -mcpu=gfx810 %s 2>&1 | FileCheck --ignore-case %s
+; RUN: not --crash llc -o - -global-isel -mtriple=amdgcn -mcpu=gfx810 %s 2>&1 | FileCheck --ignore-case %s
+; RUN: not --crash llc -o - -mtriple=amdgcn -mcpu=gfx1100 %s 2>&1 | FileCheck --ignore-case %s
+; RUN: not --crash llc -o - -global-isel -mtriple=amdgcn -mcpu=gfx1100 %s 2>&1 | FileCheck --ignore-case %s
 ;
 ; CHECK: LLVM ERROR: Cannot select
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/134179