[RISCV] Compute liveins for new basic blocks in emitStackProbeInline.

Fixes expensive check failures from #117612.

Author: topperc

llvm/lib/Target/RISCV/RISCVFrameLowering.cpp

@@ -14,6 +14,7 @@
 #include "RISCVMachineFunctionInfo.h"
 #include "RISCVSubtarget.h"
 #include "llvm/BinaryFormat/Dwarf.h"
+#include "llvm/CodeGen/LivePhysRegs.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
@@ -2066,6 +2067,8 @@ static void emitStackProbeInline(MachineFunction &MF, MachineBasicBlock &MBB,
   LoopTestMBB->addSuccessor(ExitMBB);
   LoopTestMBB->addSuccessor(LoopTestMBB);
   MBB.addSuccessor(LoopTestMBB);
+  // Update liveins.
+  fullyRecomputeLiveIns({ExitMBB, LoopTestMBB});
 }
 
 void RISCVFrameLowering::inlineStackProbe(MachineFunction &MF,

llvm/test/CodeGen/RISCV/stack-clash-prologue-nounwind.ll

@@ -1,7 +1,7 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -mtriple=riscv64 -mattr=+m -O2 < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+m -O2 < %s -verify-machineinstrs \
 ; RUN:   | FileCheck %s -check-prefix=RV64I
-; RUN: llc -mtriple=riscv32 -mattr=+m -O2 < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+m -O2 < %s -verify-machineinstrs \
 ; RUN:   | FileCheck %s -check-prefix=RV32I
 
 ; Tests copied from PowerPC.