[InstrProf] Merge COFF .lprof* and .lcovmap sections into .data/.rdata

There is no reason for these sections to remain separate in the final
DLL or EXE.

I have not yet added a InstrProfilingPlatformWindows.c for these, since
avoiding dynamic profile data registration is a larger project for
later.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@353221 91177308-0d34-0410-b5e6-96231b3b80d8