RuntimeLibcalls: Add more function entries from TargetLibraryInfo

Script scraped dump of most functions in TargetLibraryInfo.def,
with existing entries and a few special cases removed. This only
adds the definitions, and doesn't add them to any system yet.

Adding them in the correct places is the hard part, since it's
all written as opt-out with manually written exemptions in
TargetLibraryInfo.

Author: arsenm