Follow up to safe API patch

A while back, we made an initial change where dangerous C API functions were
replaced with macros that translated the dangerous API function calls to safer
function calls e.g., sprintf() replaced with KMP_SPRINTF() which translates to 
sprintf_s() on Windows. Currently, the only operating system where this is 
applicable is Windows. Unix-like systems are still using the dangerous API 
e.g., KMP_SPRINTF() translates to sprintf().  Our own testing showed no
performance differences.

Differential Revision: http://reviews.llvm.org/D9918

llvm-svn: 241833