In MacroAssembler::JumpIfNotBothSequentialAsciiStrings a custom mask

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index b3e15905aad4654d41ed8041bac60424694959fb..53dedda7ac7212ea282d8e731107e82db1870804 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -2253,7 +2253,8 @@ void MacroAssembler::JumpIfNotBothSequentialAsciiStrings(
   ASSERT(kNotStringTag != 0);
   const int kFlatAsciiStringMask =
       kIsNotStringMask | kStringRepresentationMask | kStringEncodingMask;
-  const int kFlatAsciiStringTag = ASCII_STRING_TYPE;
+  const int kFlatAsciiStringTag =
+      kStringTag | kOneByteStringTag | kSeqStringTag;
 
   andl(scratch1, Immediate(kFlatAsciiStringMask));
   andl(scratch2, Immediate(kFlatAsciiStringMask));
@@ -2299,7 +2300,8 @@ void MacroAssembler::JumpIfBothInstanceTypesAreNotSequentialAscii(
   ASSERT(kNotStringTag != 0);
   const int kFlatAsciiStringMask =
       kIsNotStringMask | kStringRepresentationMask | kStringEncodingMask;
-  const int kFlatAsciiStringTag = ASCII_STRING_TYPE;
+  const int kFlatAsciiStringTag =
+      kStringTag | kOneByteStringTag | kSeqStringTag;
 
   andl(scratch1, Immediate(kFlatAsciiStringMask));
   andl(scratch2, Immediate(kFlatAsciiStringMask));