Introduce ENABLE_LATIN_1 compile flag

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index b865cecbd2424b6d74b6413ba7709ac36135b145..d132228249d3f5bf18064d216b66723c8aece1d6 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -124,7 +124,7 @@ bool LCodeGen::GeneratePrologue() {
 
 #ifdef DEBUG
     if (strlen(FLAG_stop_at) > 0 &&
-        info_->function()->name()->IsEqualTo(CStrVector(FLAG_stop_at))) {
+        info_->function()->name()->IsUtf8EqualTo(CStrVector(FLAG_stop_at))) {
       __ int3();
     }
 #endif
@@ -2224,7 +2224,7 @@ void LCodeGen::EmitClassOfTest(Label* is_true,
 
   __ JumpIfSmi(input, is_false);
 
-  if (class_name->IsEqualTo(CStrVector("Function"))) {
+  if (class_name->IsOneByteEqualTo(STATIC_ASCII_VECTOR("Function"))) {
     // Assuming the following assertions, we can use the same compares to test
     // for both being a function type and being in the object type range.
     STATIC_ASSERT(NUM_OF_CALLABLE_SPEC_OBJECT_TYPES == 2);
@@ -2255,7 +2255,7 @@ void LCodeGen::EmitClassOfTest(Label* is_true,
 
   // Objects with a non-function constructor have class 'Object'.
   __ CmpObjectType(temp, JS_FUNCTION_TYPE, kScratchRegister);
-  if (class_name->IsEqualTo(CStrVector("Object"))) {
+  if (class_name->IsOneByteEqualTo(STATIC_ASCII_VECTOR("Object"))) {
     __ j(not_equal, is_true);
   } else {
     __ j(not_equal, is_false);
@@ -4247,7 +4247,7 @@ void LCodeGen::DoStringCharFromCode(LStringCharFromCode* instr) {
   Register result = ToRegister(instr->result());
   ASSERT(!char_code.is(result));
 
-  __ cmpl(char_code, Immediate(String::kMaxAsciiCharCode));
+  __ cmpl(char_code, Immediate(String::kMaxOneByteCharCode));
   __ j(above, deferred->entry());
   __ LoadRoot(result, Heap::kSingleCharacterStringCacheRootIndex);
   __ movq(result, FieldOperand(result,