[ast] Remove heap accesses from AST numbering

src/conversions-inl.h

Index: src/conversions-inl.h
diff --git a/src/conversions-inl.h b/src/conversions-inl.h
index d7789f9180880868baac232fbc4eeab9e58cb4d9..08766202658eabf41791c7ba255d7440794e36aa 100644
--- a/src/conversions-inl.h
+++ b/src/conversions-inl.h
@@ -122,6 +122,19 @@ bool IsUint32Double(double value) {
          value == FastUI2D(FastD2UI(value));
 }
 
+bool DoubleToUint32(double value, uint32_t* uint32_value) {
+  if (IsMinusZero(value) || value < 0 || value > kMaxUInt32) {
+    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 (value == FastUI2D(converted_value)) {
+    *uint32_value = converted_value;
+    return true;
+  }
+  return false;
+}
 
 int32_t NumberToInt32(Object* number) {
   if (number->IsSmi()) return Smi::cast(number)->value();