In MacroAssembler::JumpIfNotBothSequentialAsciiStrings a custom mask

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index ef90c10df0d1a2b414d630c724f8e14646a4ed00..b08ee92b1bf556a6a4d6d295f2443ab5d6d1ff3e 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -2798,7 +2798,8 @@ void MacroAssembler::JumpIfNotBothSequentialAsciiStrings(Register object1,
   // Check that both are flat ASCII strings.
   const int kFlatAsciiStringMask =
       kIsNotStringMask | kStringRepresentationMask | kStringEncodingMask;
-  const int kFlatAsciiStringTag = ASCII_STRING_TYPE;
+  const int kFlatAsciiStringTag =
+      kStringTag | kOneByteStringTag | kSeqStringTag;
   // Interleave bits from both instance types and compare them in one check.
   ASSERT_EQ(0, kFlatAsciiStringMask & (kFlatAsciiStringMask << 3));
   and_(scratch1, kFlatAsciiStringMask);