[libunwind][ARM] Fix loading FP registers on big-endian targets

The function Unwind-EHABI.cpp:_Unwind_VRS_Pop loads the saved values of
64-bit FP registers as two 32-bit words because they might not be
8-byte aligned. Combining these words into a 64-bit value has to be
done differently on big-endian platforms.

Reviewers: ostannard, john.brawn, dmgreen

Reviewed By: ostannard

Subscribers: kristof.beyls, christof, libcxx-commits

Tags: #libc

Differential Revision: https://reviews.llvm.org/D64996

git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@366587 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed