Cardmarking writebarrier.

src/ia32/full-codegen-ia32.cc

Index: src/ia32/full-codegen-ia32.cc
diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc
index 55c66479ba35d45d4a369ecea0943fd791e07238..ae64d023c0b926622f7bc6a1d167d91b541d4221 100644
--- a/src/ia32/full-codegen-ia32.cc
+++ b/src/ia32/full-codegen-ia32.cc
@@ -1009,7 +1009,6 @@ void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
   __ push(eax);  // Map.
   __ push(edx);  // Enumeration cache.
   __ mov(eax, FieldOperand(edx, FixedArray::kLengthOffset));
-  __ SmiTag(eax);
   __ push(eax);  // Enumeration cache length (as smi).
   __ push(Immediate(Smi::FromInt(0)));  // Initial index.
   __ jmp(&loop);
@@ -1019,7 +1018,6 @@ void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
   __ push(Immediate(Smi::FromInt(0)));  // Map (0) - force slow check.
   __ push(eax);
   __ mov(eax, FieldOperand(eax, FixedArray::kLengthOffset));
-  __ SmiTag(eax);
   __ push(eax);  // Fixed array length (as smi).
   __ push(Immediate(Smi::FromInt(0)));  // Initial index.