Add fast stack trace on ARM.

Port of the fast stack trace feature to ARM.
Add fast stack trace on AArch64.

Port of the fast stack trace feature to AArch64.
Merge branch 'fast-stack-trace-aarch64' of https://github.com/fillexen/libunwind
Merge branch 'fast-stack-trace-arm' of https://github.com/fillexen/libunwind
One time whitespace fixup.

for f in $(find src include -name '*.[ch]'); do
  expand -t 8 $f > $tmp; mv $tmp $f;
done
Store location type in local unwinding mode for x86_64

Helps support DW_CFA_val_expression