[clang] [llvm] [AMDGPU] Adding the amdgpu-num-work-groups function attribute (PR #79035)

[Jun Wang via cfe-commits]

================
@@ -1108,3 +1108,8 @@ void 
GCNUserSGPRUsageInfo::allocKernargPreloadSGPRs(unsigned NumSGPRs) {
 unsigned GCNUserSGPRUsageInfo::getNumFreeUserSGPRs() {
   return AMDGPU::getMaxNumUserSGPRs(ST) - NumUsedUserSGPRs;
 }
+
+SmallVector<unsigned>
----------------
jwanggit86 wrote:

This function calls `getIntegerVecAttribute()` which returns `SmallVector`. If 
change this to std::array<3>, the other function has to be changed as well.

https://github.com/llvm/llvm-project/pull/79035
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