[llvm] [RISCV] Allow spilling to unused Zcmp Stack (PR #125959)

[Craig Topper via llvm-commits]

topperc wrote:

This may be the fix

```
@@ -1798,7 +1800,7 @@ bool RISCVFrameLowering::assignCalleeSavedSpillSlots(
     if (MaxReg != RISCV::NoRegister) {
       auto [RegEnc, PushedRegNum] = getPushPopEncodingAndNum(MaxReg);
       RVFI->setRVPushRegs(PushedRegNum);
-      RVFI->setRVPushStackSize(alignTo((STI.getXLen() / 8) * PushedRegNum, 16));
+      RVFI->setRVPushStackSize((STI.getXLen() / 8) * PushedRegNum);
 
       // Use encoded number to represent registers to spill.
       RVFI->setRVPushRlist(RegEnc);
```

https://github.com/llvm/llvm-project/pull/125959