[ast] Remove heap accesses from AST numbering

src/conversions-inl.h

 // Copyright 2011 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.
 
 #ifndef V8_CONVERSIONS_INL_H_
 #define V8_CONVERSIONS_INL_H_
 
 #include <float.h>         // Required for DBL_MAX and on Win32 for finite()
 #include <limits.h>        // Required for INT_MAX etc.
 #include <stdarg.h>
@@ skipping 104 matching lines @@
   return !IsMinusZero(value) && value >= kMinInt && value <= kMaxInt &&
          value == FastI2D(FastD2I(value));
 }
 
 
 bool IsUint32Double(double value) {
   return !IsMinusZero(value) && value >= 0 && value <= kMaxUInt32 &&
          value == FastUI2D(FastD2UI(value));
 }
 
+bool DoubleToUint32IfEqualToSelf(double value, uint32_t* uint32_value) {
+  if (value < 0) return false;
+  // TODO(leszeks): We maybe could be faster than FastD2UI here, since we only
+  // care about the value being valid if the conversion is valid.
+  uint32_t converted_value = FastD2UI(value);
+  if (FastUI2D(converted_value) == value) {
+    *uint32_value = converted_value;
+    return true;
+  }
+  return false;
+}
 
 int32_t NumberToInt32(Object* number) {
   if (number->IsSmi()) return Smi::cast(number)->value();
   return DoubleToInt32(number->Number());
 }
 
 uint32_t NumberToUint32(Object* number) {
   if (number->IsSmi()) return Smi::cast(number)->value();
   return DoubleToUint32(number->Number());
 }
@@ skipping 649 matching lines @@
   buffer[buffer_pos] = '\0';
 
   double converted = Strtod(Vector<const char>(buffer, buffer_pos), exponent);
   return (sign == NEGATIVE) ? -converted : converted;
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CONVERSIONS_INL_H_