Move TargetLibraryInfo data from two files into one common .def file.

Summary:
This makes it more obvious that the enum definition and the
"StandardName" array is in sync. Mechanically refactored w/ a
python script.

Test Plan: still compiles

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D7845

llvm-svn: 231172