Currently when the number passed to TryNumberToSize is 1 << 64,
it gets away with a bug caused by rounding of mantissa.
Then the number will be casted to 0 and TryNumberToSize
will return true. This patch fix this by making the range check
more accurate.

BUG=v8:5712

Review-Url: https://codereview.chromium.org/2548243004
Cr-Commit-Position: refs/heads/master@{#41578}