[llvm] [RISCV] Add stack clash vector support (PR #119458)

[Raphael Moreira Zinsly via llvm-commits]

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@@ -914,6 +966,19 @@ void RISCVFrameLowering::emitPrologue(MachineFunction &MF,
             .addImm(ShiftAmount)
             .setMIFlag(MachineInstr::FrameSetup);
       }
+      if (NeedProbe && RVVStackSize == 0) {
+        // Do a probe if the align + size allocated just passed the probe size
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rzinsly wrote:

I added the f10 test in llvm/test/CodeGen/RISCV/stack-clash-prologue.ll to test this.

https://github.com/llvm/llvm-project/pull/119458