This partially reverts e522ed45, 2f9604c9, e848d130.

Needs an appropriate "if" on a future LangOpts::incremantallyProcessing.

This gets picked up by jenkins and marks the PR builds as unstable.

This will fix the issue that cling will try to invoke "OFF " to find headers.

Signed-off-by: Vassil Vassilev <vvasilev@cern.ch>

Refactor Interpreter::loadFile to call into these methods.

Signed-off-by: Vassil Vassilev <vvasilev@cern.ch>

Thanks to Roman mentioning: "My reading of the code that computes size and calls reserveAllocationSpace has already factored in the worst case scenarios due to alignment."

COFF format currently needs a few changes in LLVM to function properly