Fixed infinite loops and buffer overflow in byte_scan when scanning for integers and floating-point numbers.
- The byte_scan and associated functions are not very well written. I tried to clean them as much as possible without re-writing the whole thing.
- Replaced lBuildFloatValue function with atof. lBuildFloatValue was returning incorrect value anyway. The only reason it was working so far because we never used that value.
BUG=59623(crbug.com), 603333(bugzilla.mozilla.org)
Review URL: http://codereview.appspot.com/2655042

git-svn-id: https://angleproject.googlecode.com/svn/trunk@469 736b8ea6-26fd-11df-bfd4-992fa37f6226