Bug 1139299 - Fix align stack in Simulator-mips::call. r=rankov, r=nbp

js/src/jit/mips/Simulator-mips.cpp

@@ -3423,7 +3423,7 @@ Simulator::call(uint8_t *entry, int argument_count, ...)
     else
         entry_stack = entry_stack - kCArgsSlotsSize;
 
-    entry_stack &= ~ABIStackAlignment;
+    entry_stack &= ~(ABIStackAlignment - 1);
 
     intptr_t *stack_argument = reinterpret_cast<intptr_t*>(entry_stack);