[clang] [llvm] [NFC][AMDGPU] Pre-commit clang and llvm tests for dynamic allocas (PR #120063)

[Matt Arsenault via llvm-commits]

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+// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 5
+// RUN: %clang_cc1 -triple amdgcn-amd-amdhsa -x hip -emit-llvm -fcuda-is-device -o - %s | FileCheck %s
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arsenm wrote:

I think there are already some clang tests for this, not sure what the point of this part is. We do need unit tests which execute the code 

https://github.com/llvm/llvm-project/pull/120063