Bug 850548 - fix ion::StackAlignment value on non-GNU (r=dvander)

--HG--
extra : rebase_source : 424e4aa6cdd104b0c7f47b9c6495f45c770d155f

js/src/ion/x86/Assembler-x86.h

@@ -66,7 +66,11 @@ static const Register PreBarrierReg = edx;
 
 // GCC stack is aligned on 16 bytes, but we don't maintain the invariant in
 // jitted code.
+#if defined(__GNUC__)
 static const uint32_t StackAlignment = 16;
+#else
+static const uint32_t StackAlignment = 4;
+#endif
 static const bool StackKeptAligned = false;
 
 struct ImmTag : public Imm32