Review comments: Start moving all EHABI code from UnwindLevel1.c into EHABI file

This only copies the existing code over, no changes yet.

Change-Id: Id361a59114da8eccb6fa670236e810d77a006cce
Review comments: Remove preprocessor conditionals from Level1 and EHABI.

Unwind-EHABI always takes the EHABI branches, Level1 always the
non-EHABI branches.

Change-Id: I6fcdef8dc2be1bbb5884d082f8b425516b7768af
Review feedback: clang-format lines longer than 80cols in Unwind-EHABI.cpp

Change-Id: Ie8a9dedb61c7e497b8fdcbf22e7d9a1bb42346c0
Merge pull request #149 from awong-dev/unfork

Review comments: Move all ehabi-specific code into Unwind-EHABI.cpp.