remove latin-1 flag

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index f68672d340085c4ef12ce75cbffe5c52593cf1fc..4f42d29a1d450c7aecf850e68c35263eac12928b 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -5675,9 +5675,7 @@ MUST_USE_RESULT static MaybeObject* ConvertCaseHelper(
 namespace {
 
 static const uintptr_t kOneInEveryByte = kUintptrAllBitsSet / 0xFF;
-#ifdef ENABLE_LATIN_1
 static const uintptr_t kAsciiMask = kOneInEveryByte << 7;
-#endif
 
 // Given a word and two range boundaries returns a word with high bit
 // set in every byte iff the corresponding input byte was strictly in
@@ -5690,11 +5688,6 @@ static inline uintptr_t AsciiRangeMask(uintptr_t w, char m, char n) {
   // Use strict inequalities since in edge cases the function could be
   // further simplified.
   ASSERT(0 < m && m < n);
-#ifndef ENABLE_LATIN_1
-  // Every byte in an ASCII string is less than or equal to 0x7F.
-  ASSERT((w & (kOneInEveryByte * 0x7F)) == w);
-  ASSERT(n < 0x7F);
-#endif
   // Has high bit set in every w byte less than n.
   uintptr_t tmp1 = kOneInEveryByte * (0x7F + n) - w;
   // Has high bit set in every w byte greater than m.
@@ -5711,11 +5704,7 @@ enum AsciiCaseConversion {
 
 template <AsciiCaseConversion dir>
 struct FastAsciiConverter {
-#ifdef ENABLE_LATIN_1
   static bool Convert(char* dst, char* src, int length, bool* changed_out) {
-#else
-  static bool Convert(char* dst, char* src, int length) {
-#endif
 #ifdef DEBUG
     char* saved_dst = dst;
     char* saved_src = src;
@@ -5727,18 +5716,14 @@ struct FastAsciiConverter {
     const char lo = (dir == ASCII_TO_LOWER) ? 'A' - 1 : 'a' - 1;
     const char hi = (dir == ASCII_TO_LOWER) ? 'Z' + 1 : 'z' + 1;
     bool changed = false;
-#ifdef ENABLE_LATIN_1
     uintptr_t or_acc = 0;
-#endif
     char* const limit = src + length;
 #ifdef V8_HOST_CAN_READ_UNALIGNED
     // Process the prefix of the input that requires no conversion one
     // (machine) word at a time.
     while (src <= limit - sizeof(uintptr_t)) {
       uintptr_t w = *reinterpret_cast<uintptr_t*>(src);
-#ifdef ENABLE_LATIN_1
       or_acc |= w;
-#endif
       if (AsciiRangeMask(w, lo, hi) != 0) {
         changed = true;
         break;
@@ -5751,9 +5736,7 @@ struct FastAsciiConverter {
     // required one word at a time.
     while (src <= limit - sizeof(uintptr_t)) {
       uintptr_t w = *reinterpret_cast<uintptr_t*>(src);
-#ifdef ENABLE_LATIN_1
       or_acc |= w;
-#endif
       uintptr_t m = AsciiRangeMask(w, lo, hi);
       // The mask has high (7th) bit set in every byte that needs
       // conversion and we know that the distance between cases is
@@ -5767,9 +5750,7 @@ struct FastAsciiConverter {
     // unaligned access is not supported).
     while (src < limit) {
       char c = *src;
-#ifdef ENABLE_LATIN_1
       or_acc |= c;
-#endif
       if (lo < c && c < hi) {
         c ^= (1 << 5);
         changed = true;
@@ -5778,20 +5759,14 @@ struct FastAsciiConverter {
       ++src;
       ++dst;
     }
-#ifdef ENABLE_LATIN_1
     if ((or_acc & kAsciiMask) != 0) {
       return false;
     }
-#endif
 #ifdef DEBUG
     CheckConvert(saved_dst, saved_src, length, changed);
 #endif
-#ifdef ENABLE_LATIN_1
     *changed_out = changed;
     return true;
-#else
-    return changed;
-#endif
   }
 
 #ifdef DEBUG
@@ -5856,13 +5831,6 @@ MUST_USE_RESULT static MaybeObject* ConvertCase(
       if (!maybe_o->ToObject(&o)) return maybe_o;
     }
     SeqOneByteString* result = SeqOneByteString::cast(o);
-#ifndef ENABLE_LATIN_1
-    bool has_changed_character = ConvertTraits::AsciiConverter::Convert(
-        reinterpret_cast<char*>(result->GetChars()),
-        reinterpret_cast<char*>(SeqOneByteString::cast(s)->GetChars()),
-        length);
-    return has_changed_character ? result : s;
-#else
     bool has_changed_character;
     bool is_ascii = ConvertTraits::AsciiConverter::Convert(
         reinterpret_cast<char*>(result->GetChars()),
@@ -5873,7 +5841,6 @@ MUST_USE_RESULT static MaybeObject* ConvertCase(
     if (is_ascii) {
       return has_changed_character ? result : s;
     }
-#endif
   }
 
   Object* answer;