Merging r341312:

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r341312 | psmith | 2018-09-03 05:36:32 -0700 (Mon, 03 Sep 2018) | 13 lines

[Aarch64] Fix linker emulation for Aarch64 big endian

This patch fixes target linker emulation for aarch64 big endian.
aarch64_be_linux is not recognized by gnu ld. The equivalent emulation
mode supported by gnu ld is aarch64linuxb.

Patch by: Bharathi Seshadri

Reviewed by: Peter Smith

Differential Revision: https://reviews.llvm.org/D42930

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llvm-svn: 345920
2 files changed