Improve dr_sscanf integer parsing compatibility for drmemory
Improve dr_sscanf integer parsing compatibility for drmemory

- Add support for I32 and I64, since DR exports format string macros
  that use them.
- Skip leading blanks when parsing integers, as done by regular
  sscanf().

Review URL: https://codereview.appspot.com/6826075

SVN-Revision: 1700

code4bones/dynamorio,code4bones/dynamorio,code4bones/dynamorio,bl4ckic3/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,daksunt/dynamorio,AmesianX/dynamorio,bl4ckic3/dynamorio,sigma-random/dynamorio,sigma-random/dynamorio,code4bones/dynamorio,bl4ckic3/dynamorio,sigma-random/dynamorio,daksunt/dynamorio,daksunt/dynamorio,daksunt/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,daksunt/dynamorio,code4bones/dynamorio,bl4ckic3/dynamorio,bl4ckic3/dynamorio,sigma-random/dynamorio,sigma-random/dynamorio