[llvm] [GlobalISel] Avoid unnecessary call setup work (NFC) (PR #221892)

[Nathan Corbyn via llvm-commits]

================
@@ -211,7 +200,8 @@ bool CallLowering::lowerCall(MachineIRBuilder &MIRBuilder, const CallBase &CB,
   Register ReturnHintAlignReg;
   Align ReturnHintAlign;
 
-  Info.OrigRet = ArgInfo{ResRegs, RetTy, 0, getAttributesForReturn(CB)};
+  ISD::ArgFlagsTy RetFlags;
+  Info.OrigRet = ArgInfo{ResRegs, RetTy, 0, RetFlags};
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cofibrant wrote:

I'm not sure I follow where the
```
addFlagsFromAttrSet(RetFlags, CB.getAttributes().getRetAttrs());
```
went?

https://github.com/llvm/llvm-project/pull/221892