Add for-of Crankshaft support

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 82ef657c2900ebb2a89469c4751790c58509092f..09b072516604f2eaf0d6247faa9245c6d69c5e0d 100644
--- a/src/ia32/full-codegen-ia32.cc
+++ b/src/ia32/full-codegen-ia32.cc
@@ -1213,16 +1213,6 @@ void FullCodeGenerator::VisitForOfStatement(ForOfStatement* stmt) {
   __ CompareRoot(eax, Heap::kNullValueRootIndex);
   __ j(equal, loop_statement.break_label());
 
-  // Convert the iterator to a JS object.
-  Label convert, done_convert;
-  __ JumpIfSmi(eax, &convert);
-  __ CmpObjectType(eax, FIRST_SPEC_OBJECT_TYPE, ecx);
-  __ j(above_equal, &done_convert);
-  __ bind(&convert);
-  __ push(eax);
-  __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
-  __ bind(&done_convert);
-
   // Loop entry.
   __ bind(loop_statement.continue_label());
 
@@ -1237,14 +1227,15 @@ void FullCodeGenerator::VisitForOfStatement(ForOfStatement* stmt) {
                   &result_not_done);
   __ bind(&result_not_done);
 
+  PrepareForBailoutForId(stmt->BodyId(), NO_REGISTERS);
+
   // each = result.value
   VisitForEffect(stmt->assign_each());
 
   // Generate code for the body of the loop.
   Visit(stmt->body());
 
-  // Check stack before looping.
-  PrepareForBailoutForId(stmt->BackEdgeId(), NO_REGISTERS);
+  // Loop.
   EmitBackEdgeBookkeeping(stmt, loop_statement.continue_label());
   __ jmp(loop_statement.continue_label());