[clang] [llvm] [SPARC] Support reserving arbitrary general purpose registers (PR #74927)

[via cfe-commits]

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@@ -1125,6 +1130,10 @@ Register SparcTargetLowering::getRegisterByName(const 
char* RegName, LLT VT,
     .Case("g4", SP::G4).Case("g5", SP::G5).Case("g6", SP::G6).Case("g7", 
SP::G7)
     .Default(0);
 
+  const SparcRegisterInfo *TRI = Subtarget->getRegisterInfo();
+  if (!TRI->isReservedReg(MF, Reg))
+    Reg = 0;
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koachan wrote:

Thanks, added a test for the crashing case.

https://github.com/llvm/llvm-project/pull/74927
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