[llvm] [AMDGPU] Fix s_buffer_load crash for illegal result types (PR #215483)

[Arseniy Obolenskiy via llvm-commits]

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@@ -93,6 +93,12 @@ static unsigned findFirstFreeSGPR(CCState &CCInfo) {
   llvm_unreachable("Cannot allocate sgpr");
 }
 
+// Marked Custom for s_buffer_load alone. The action applies to the whole
+// opcode, so ReplaceNodeResults must not divert other intrinsics returning one
+// of these types.
+static constexpr MVT SBufferLoadOnlyChainTypes[] = {MVT::i1, MVT::i4, MVT::v2i1,
+                                                    MVT::v6i8};
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aobolensk wrote:

Reworked

https://github.com/llvm/llvm-project/pull/215483