Fix a MOV instruction in Optimizing's x86-64 code generator.

Use `movl' instead of `movw' to store a 32-bit immediate
(integer or reference) into a field.

Also fix art::Location::RegisterOrInt32LongConstant to
properly handle non-long constants.

Change-Id: I34c6ec8eaa1632822a31969f87c9c2d6c5b96326
diff --git a/compiler/optimizing/code_generator_x86_64.cc b/compiler/optimizing/code_generator_x86_64.cc
index 22f5d96..afffbe2 100644
--- a/compiler/optimizing/code_generator_x86_64.cc
+++ b/compiler/optimizing/code_generator_x86_64.cc
@@ -3337,7 +3337,7 @@
     case Primitive::kPrimNot: {
       if (value.IsConstant()) {
         int32_t v = CodeGenerator::GetInt32ValueOf(value.GetConstant());
-        __ movw(Address(base, offset), Immediate(v));
+        __ movl(Address(base, offset), Immediate(v));
       } else {
         __ movl(Address(base, offset), value.AsRegister<CpuRegister>());
       }