Bug 1472233: Add missed register save for Ion emitCompareStringResult r=jandem

--HG--
extra : rebase_source : 791a93a6d5800c43a7d2f980fe29d9a4f4958683
extra : source : 94543110b6eddf5d23b6d4ba51821a4894243f32

js/src/jit/IonCacheIRCompiler.cpp

@@ -1337,6 +1337,7 @@ IonCacheIRCompiler::emitCallStringSplitResult()
 bool
 IonCacheIRCompiler::emitCompareStringResult()
 {
+    AutoSaveLiveRegisters save(*this);
     AutoOutputRegister output(*this);
 
     Register left = allocator.useRegister(masm, reader.stringOperandId());
@@ -1345,10 +1346,6 @@ IonCacheIRCompiler::emitCompareStringResult()
 
     AutoScratchRegisterMaybeOutput scratch(allocator, masm, output);
 
-    FailurePath* failure;
-    if (!addFailurePath(&failure))
-        return false;
-
     allocator.discardStack(masm);
 
     Label slow, done;