[llvm] [X86][APX] Implement Windows APX ABI callee-saved registers per Microsoft spec (PR #200391)

[Timur Golubovich via llvm-commits]

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@@ -1135,9 +1135,13 @@ def CSR_32EHRet : CalleeSavedRegs<(add EAX, EDX, CSR_32)>;
 def CSR_64EHRet : CalleeSavedRegs<(add RAX, RDX, CSR_64)>;
 
 def CSR_Win64_NoSSE : CalleeSavedRegs<(add RBX, RBP, RDI, RSI, R12, R13, R14, R15)>;
+def CSR_Win64_EGPR : CalleeSavedRegs<(add R30, R31)>;
+def CSR_Win64_NoSSE_APX : CalleeSavedRegs<(add CSR_Win64_NoSSE, CSR_Win64_EGPR)>;
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timurgol007 wrote:

Addressed

https://github.com/llvm/llvm-project/pull/200391