Recommit "[ELF] - Add ability for DWARFContextInMemory to exit early when any error happen."

With fix in include folder character case:
#include "llvm/Codegen/AsmPrinter.h" -> #include "llvm/CodeGen/AsmPrinter.h"

Original commit message:

Change introduces error reporting policy for DWARFContextInMemory.
New callback provided by client is able to handle error on it's
side and return Halt or Continue.

That allows to either keep current behavior when parser prints all errors
but continues parsing object or implement something very different, like
stop parsing on a first error and report an error in a client style.

Differential revision: https://reviews.llvm.org/D34328

llvm-svn: 306517