MIPS: Fix deoptimization failure in WordCompare

src/full-codegen/mips/full-codegen-mips.cc

Index: src/full-codegen/mips/full-codegen-mips.cc
diff --git a/src/full-codegen/mips/full-codegen-mips.cc b/src/full-codegen/mips/full-codegen-mips.cc
index 83bc1ae91d7fcfe99fff316def388f097ec09968..6e59ba9232d8a27a3895aade232dc1ae1fc95ef9 100644
--- a/src/full-codegen/mips/full-codegen-mips.cc
+++ b/src/full-codegen/mips/full-codegen-mips.cc
@@ -736,7 +736,7 @@ void FullCodeGenerator::PrepareForBailoutBeforeSplit(Expression* expr,
   PrepareForBailout(expr, BailoutState::TOS_REGISTER);
   if (should_normalize) {
     __ LoadRoot(t0, Heap::kTrueValueRootIndex);
-    Split(eq, a0, Operand(t0), if_true, if_false, NULL);
+    Split(eq, v0, Operand(t0), if_true, if_false, NULL);
     __ bind(&skip);
   }
 }