[clang] [AMDGPU] Modifies builtin def to take _Float16('x') for both HIP/C++ and for OpenCL (PR #167652)

[Shilei Tian via cfe-commits]

================
@@ -10527,6 +10527,21 @@ bool ASTContext::areCompatibleVectorTypes(QualType 
FirstVec,
       Second->getVectorKind() != VectorKind::RVVFixedLengthMask_4)
     return true;
 
+  // In OpenCL, treat half and _Float16 vector types as compatible.
----------------
shiltian wrote:

I'd move this part to a RFC PR, and add more OpenCL folks (outside of AMD) to 
review. I think this change needs more prudent review. After that is merged, we 
can just do a simple NFC change here.

https://github.com/llvm/llvm-project/pull/167652
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