[clang] [ARM] Fix test using thumb instead arm arch prefix (PR #166416)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Tomer Shafir (tomershafir)

<details>
<summary>Changes</summary>

Currently, the ARM backend incorrectly parses every `arm` prefixed arch to be non-thumb, but `armv6m` is THUMB and doesnt have ARM ops causing the test to fail: `error: Function 'foo' uses ARM instructions, but the target does not support ARM mode execution.`

As a quick triage, this change switches the test to use `thumb`.

Uncovered by https://github.com/llvm/llvm-project/pull/151404

---
Full diff: https://github.com/llvm/llvm-project/pull/166416.diff


1 Files Affected:

- (modified) clang/test/CodeGen/pr45476.cpp (+1-1) 


``````````diff
diff --git a/clang/test/CodeGen/pr45476.cpp b/clang/test/CodeGen/pr45476.cpp
index c95f7fb8cd9c3..3a67904a8e568 100644
--- a/clang/test/CodeGen/pr45476.cpp
+++ b/clang/test/CodeGen/pr45476.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -triple armv6m-eabi -emit-llvm %s -o - | FileCheck -check-prefix=LIBCALL %s
+// RUN: %clang_cc1 -triple thumbv6m-eabi -emit-llvm %s -o - | FileCheck -check-prefix=LIBCALL %s
 // RUN: %clang_cc1 -triple armv8-eabi -emit-llvm %s -o - | FileCheck -check-prefix=NATIVE %s
 // PR45476
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/166416