[PGO] Fix buildbot failure on FreeBSD (when building __x86_64__ lib)
[PGO] Fix buildbot failure on FreeBSD (when building __x86_64__ lib)

There seems to be a problem in system header (stdint.h) of FreeBSD
where uint8_t nor uint16_t are defined.  Explicitly define the key
types as done for FreeBSD i386. 



git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@253703 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt