[ARM] Create relocations for Thumb functions calling ARM fns in ELF.

Summary:
Without using a fixup in this case, BL will be used instead of BLX to
call internal ARM functions from Thumb functions.

Reviewers: rafael, t.p.northover, peter.smith, kristof.beyls

Reviewed By: peter.smith

Subscribers: srhines, echristo, aemerson, rengolin, javed.absar, llvm-commits

Differential Revision: https://reviews.llvm.org/D33436

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304413 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed