[clang] [llvm] AMDGPU: Add builtin/intrinsic global_(load|store)_b128 (PR #172090)

[Matt Arsenault via cfe-commits]

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@@ -0,0 +1,26 @@
+// We test loads and stores separately because clang only seems to exit after
+// the first 'target feature' error.
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arsenm wrote:

It's annoying behavior, but it's per-function. If you jam all the cases into one function that will also work 

https://github.com/llvm/llvm-project/pull/172090