Revert of Internalize strings in-place

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 084901783e2ddba1c002483ac23115445bc62a0d..0c7c2203f0708d13a2938f9363454da54e9ce4a2 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -2564,13 +2564,11 @@ void MacroAssembler::JumpIfNotBothSequentialOneByteStrings(Register object1,
   const int kFlatOneByteStringTag =
       kStringTag | kOneByteStringTag | kSeqStringTag;
   // Interleave bits from both instance types and compare them in one check.
-  const int kShift = 8;
-  DCHECK_EQ(0, kFlatOneByteStringMask & (kFlatOneByteStringMask << kShift));
+  DCHECK_EQ(0, kFlatOneByteStringMask & (kFlatOneByteStringMask << 3));
   and_(scratch1, kFlatOneByteStringMask);
   and_(scratch2, kFlatOneByteStringMask);
-  shl(scratch2, kShift);
-  or_(scratch1, scratch2);
-  cmp(scratch1, kFlatOneByteStringTag | (kFlatOneByteStringTag << kShift));
+  lea(scratch1, Operand(scratch1, scratch2, times_8, 0));
+  cmp(scratch1, kFlatOneByteStringTag | (kFlatOneByteStringTag << 3));
   j(not_equal, failure);
 }