tree dd32f19d32e9c62880a0fba5faf4c611a4b77171
parent 0cf02f2b548a03b5219f3697d561a69f73b53f50
author Saleem Abdulrasool <compnerd@compnerd.org> 1590765935 -0700
committer Copybara-Service <copybara-worker@google.com> 1598638618 -0700

unwind: use a more portable endianness check in EHABI

The ARM specific code was trying to determine endianness using the
`__LITTLE_ENDIAN__` macro which is not guaranteed to be defined.
When not defined, it makes libunwind to build the big-endian code even
when the compiler builds for a little-endian target.

This change allows building libunwind with the `musl-gcc` toolchain
which does not define `__LITTLE_ENDIAN__`.  Use `__BYTE_ORDER__`
instead.

Patch by Idan Freiberg!

GitOrigin-RevId: 68c50708d1f2b9aee3f10ec710df0b1387f701e5