[libunwind] Fix Unwind-EHABI.cpp:getByte on big-endian targets

The function getByte is dependent on endianness and the current
behavior is incorrect on big-endian targets.

This patch fixes the issue.

Reviewers: phosek, ostannard, dmgreen, christof, chill

Reviewed By: ostannard, chill

Subscribers: chill, christof, libcxx-commits

Tags: #libc

Differential Revision: https://reviews.llvm.org/D64402

git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@365505 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed