[for-in] Record slow path feedback only when we hit %ForInFilter.

src/full-codegen/arm64/full-codegen-arm64.cc

Index: src/full-codegen/arm64/full-codegen-arm64.cc
diff --git a/src/full-codegen/arm64/full-codegen-arm64.cc b/src/full-codegen/arm64/full-codegen-arm64.cc
index bc75f4767fdb4d431a01e4f89117e947fc758618..de16f16a54821df31770ed30503b4f8751902f3f 100644
--- a/src/full-codegen/arm64/full-codegen-arm64.cc
+++ b/src/full-codegen/arm64/full-codegen-arm64.cc
@@ -1072,10 +1072,6 @@ void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
   // We got a fixed array in register x0. Iterate through that.
   __ Bind(&fixed_array);
 
-  int const vector_index = SmiFromSlot(slot)->value();
-  __ EmitLoadTypeFeedbackVector(x1);
-  __ Mov(x10, Operand(TypeFeedbackVector::MegamorphicSentinel(isolate())));
-  __ Str(x10, FieldMemOperand(x1, FixedArray::OffsetOfElementAt(vector_index)));
   __ Mov(x1, Smi::FromInt(1));  // Smi(1) indicates slow check.
   __ Ldr(x2, FieldMemOperand(x0, FixedArray::kLengthOffset));
   __ Push(x1, x0, x2);  // Smi and array, fixed array length (as smi).
@@ -1108,12 +1104,8 @@ void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
   __ Cmp(x11, x2);
   __ B(eq, &update_each);
 
-  // We might get here from TurboFan or Crankshaft when something in the
-  // for-in loop body deopts and only now notice in fullcodegen, that we
-  // can now longer use the enum cache, i.e. left fast mode. So better record
-  // this information here, in case we later OSR back into this loop or
-  // reoptimize the whole function w/o rerunning the loop with the slow
-  // mode object in fullcodegen (which would result in a deopt loop).
+  // We need to filter the key, record slow-path here.
+  int const vector_index = SmiFromSlot(slot)->value();
   __ EmitLoadTypeFeedbackVector(x0);
   __ Mov(x10, Operand(TypeFeedbackVector::MegamorphicSentinel(isolate())));
   __ Str(x10, FieldMemOperand(x0, FixedArray::OffsetOfElementAt(vector_index)));