[llvm] [X86][IPRA] Add getIPRACSRegs since frame registers are risked to be optimized out. (PR #109597)

[Shengchen Kan via llvm-commits]

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@@ -1104,6 +1104,9 @@ def CC_X86 : CallingConv<[
 
 def CSR_NoRegs : CalleeSavedRegs<(add)>;
 
+def CSR_IPRA_32 : CalleeSavedRegs<(add EBP, ESI)>;
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KanRobert wrote:

Why ESI, RBX? Are they  frame pointer registers? Could you add tests?

https://github.com/llvm/llvm-project/pull/109597