Reapply "PGO: Statically generate data structures"

Reapply r204079 and r204083, this time with stubs for fputc in
compiler-rt.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@204091 91177308-0d34-0410-b5e6-96231b3b80d8