Introduce ENABLE_LATIN_1 compile flag

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index 92f55b8049303380244e5b3ccd989dcf02d794ab..79ce3c4a18f9f35250794d195770cbb7c5e4b6e3 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -5472,10 +5472,10 @@ void StringCharFromCodeGenerator::GenerateFast(MacroAssembler* masm) {
   // Fast case of Heap::LookupSingleCharacterStringFromCode.
   STATIC_ASSERT(kSmiTag == 0);
   STATIC_ASSERT(kSmiShiftSize == 0);
-  ASSERT(IsPowerOf2(String::kMaxAsciiCharCode + 1));
+  ASSERT(IsPowerOf2(String::kMaxOneByteCharCode + 1));
   __ test(code_,
           Immediate(kSmiTagMask |
-                    ((~String::kMaxAsciiCharCode) << kSmiTagSize)));
+                    ((~String::kMaxOneByteCharCode) << kSmiTagSize)));
   __ j(not_zero, &slow_case_);
 
   Factory* factory = masm->isolate()->factory();