[llvm] [llvm][RISCV] Set ScalableVector stack id in proper place (PR #117862)

[Craig Topper via llvm-commits]

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@@ -1610,6 +1610,8 @@ bool RISCVFrameLowering::assignCalleeSavedSpillSlots(
         int FrameIdx = MFI.CreateFixedSpillStackObject(Size, Offset);
         assert(FrameIdx < 0);
         CS.setFrameIdx(FrameIdx);
+        if (RISCVRegisterInfo::isRVVRegClass(RC))
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topperc wrote:

There aren't any vector registers in `FixedCSRFIMap` so I don't think this can happen.

https://github.com/llvm/llvm-project/pull/117862