Subzero: Allow deeper levels of variable splitting.

src/IceTargetLoweringMIPS32.cpp

Index: src/IceTargetLoweringMIPS32.cpp
diff --git a/src/IceTargetLoweringMIPS32.cpp b/src/IceTargetLoweringMIPS32.cpp
index 5fd0901ffbd405b21db5da17fcc2fa7ee72ce9bd..9d1d57181733fdaedbdd3b0aadac8cf1ac325ada 100644
--- a/src/IceTargetLoweringMIPS32.cpp
+++ b/src/IceTargetLoweringMIPS32.cpp
@@ -468,9 +468,10 @@ OperandMIPS32Mem *TargetMIPS32::formMemoryOperand(Operand *Operand, Type Ty) {
   // to work with. MIPS always requires a base register, so just use that to
   // hold the operand.
   auto *Base = llvm::cast<Variable>(legalize(Operand, Legal_Reg));
+  const int32_t Offset = Base->hasStackOffset() ? Base->getStackOffset() : 0;
   return OperandMIPS32Mem::create(
-      Func, Ty, Base, llvm::cast<ConstantInteger32>(
-                          Ctx->getConstantInt32(Base->getStackOffset())));
+      Func, Ty, Base,
+      llvm::cast<ConstantInteger32>(Ctx->getConstantInt32(Offset)));
 }
 
 void TargetMIPS32::emitVariable(const Variable *Var) const {