Rename __ProfileData to __llvm_pgo_data

<rdar://problem/15943240>

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@204083 91177308-0d34-0410-b5e6-96231b3b80d8
Switch from fputc to putc to fix r204079?

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@204084 91177308-0d34-0410-b5e6-96231b3b80d8