Bug 1360852 - Fix emitGuardIsInt32Index to allocate input register before calling addFailurePath. r=evilpie

--HG--
extra : amend_source : ca2f2995afbe85ab9b8b3662bb7f8bbf22d91b22

js/src/jit/CacheIRCompiler.cpp

@@ -1277,12 +1277,12 @@ CacheIRCompiler::emitGuardIsInt32Index()
         return true;
     }
 
+    ValueOperand input = allocator.useValueRegister(masm, inputId);
+
     FailurePath* failure;
     if (!addFailurePath(&failure))
         return false;
 
-    ValueOperand input = allocator.useValueRegister(masm, inputId);
-
     Label notInt32, done;
     masm.branchTestInt32(Assembler::NotEqual, input, &notInt32);
     masm.unboxInt32(input, output);