Provide baseline for experimental GC implementation.

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index 3233be716d09e3f7a2944c3d2730a960be44a830..a30a3c931cb8ff2f298b4c814a9b8e16312cfc2e 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -3908,12 +3908,16 @@ void RegExpExecStub::Generate(MacroAssembler* masm) {
   // Store last subject and last input.
   __ mov(eax, Operand(esp, kSubjectOffset));
   __ mov(FieldOperand(ebx, RegExpImpl::kLastSubjectOffset), eax);
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
   __ mov(ecx, ebx);
   __ RecordWrite(ecx, RegExpImpl::kLastSubjectOffset, eax, edi);
+#endif
   __ mov(eax, Operand(esp, kSubjectOffset));
   __ mov(FieldOperand(ebx, RegExpImpl::kLastInputOffset), eax);
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
   __ mov(ecx, ebx);
   __ RecordWrite(ecx, RegExpImpl::kLastInputOffset, eax, edi);
+#endif
 
   // Get the static offsets vector filled by the native regexp code.
   ExternalReference address_of_static_offsets_vector =