Introduce ENABLE_LATIN_1 compile flag

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index babffbf659882cab9c928dfe2f62116a9b376894..1606996d20b9e2fdc5f9e2144b167f3ac78aab6c 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -253,15 +253,13 @@ const int kBinary32ExponentShift = 23;
 // other bits set.
 const uint64_t kQuietNaNMask = static_cast<uint64_t>(0xfff) << 51;
 
-// ASCII/UTF-16 constants
+// Latin1/UTF-16 constants
 // Code-point values in Unicode 4.0 are 21 bits wide.
 // Code units in UTF-16 are 16 bits wide.
 typedef uint16_t uc16;
 typedef int32_t uc32;
-const int kASCIISize    = kCharSize;
+const int kOneByteSize    = kCharSize;
 const int kUC16Size     = sizeof(uc16);      // NOLINT
-const uc32 kMaxAsciiCharCode = 0x7f;
-const uint32_t kMaxAsciiCharCodeU = 0x7fu;
 
 
 // The expression OFFSET_OF(type, field) computes the byte-offset