Fixed deopt reasons in TaggedToI.

src/arm64/lithium-codegen-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/arm64/lithium-codegen-arm64.h"
 #include "src/arm64/lithium-gap-resolver-arm64.h"
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 5627 matching lines @@
     __ Cset(output, eq);
     __ Ccmp(input, false_root, ZFlag, ne);
     __ B(eq, &done);
 
     // Output contains zero, undefined is converted to zero for truncating
     // conversions.
     DeoptimizeIfNotRoot(input, Heap::kUndefinedValueRootIndex,
                         instr->environment());
   } else {
     Register output = ToRegister32(instr->result());
-
     DoubleRegister dbl_scratch2 = ToDoubleRegister(temp2);
 
-    // Deoptimized if it's not a heap number.
+    __ RecordComment("Deferred TaggedToI: not a heap number");
     DeoptimizeIfNotRoot(scratch1, Heap::kHeapNumberMapRootIndex,
                         instr->environment());
 
     // A heap number: load value and convert to int32 using non-truncating
     // function. If the result is out of range, branch to deoptimize.
     __ Ldr(dbl_scratch1, FieldMemOperand(input, HeapNumber::kValueOffset));
     __ TryRepresentDoubleAsInt32(output, dbl_scratch1, dbl_scratch2);
+    __ RecordComment("Deferred TaggedToI: lost precision or NaN");
     DeoptimizeIf(ne, instr->environment());
 
     if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
       __ Cmp(output, 0);
       __ B(ne, &done);
       __ Fmov(scratch1, dbl_scratch1);
+      __ RecordComment("Deferred TaggedToI: minus zero");
       DeoptimizeIfNegative(scratch1, instr->environment());
     }
   }
   __ Bind(&done);
 }
 
 
 void LCodeGen::DoTaggedToI(LTaggedToI* instr) {
   class DeferredTaggedToI: public LDeferredCode {
    public:
@@ skipping 380 matching lines @@
   Handle<ScopeInfo> scope_info = instr->scope_info();
   __ Push(scope_info);
   __ Push(ToRegister(instr->function()));
   CallRuntime(Runtime::kPushBlockContext, 2, instr);
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 
 } }  // namespace v8::internal