Add support for arm64 compact unwind tables, used on darwin arm64

Description

Add support for arm64 compact unwind tables, used on darwin arm64
systems (ios, tvos, watchos). It's a simple format to use now that
I have i386/x86_64 supported already.

The unwind instructions are only valid at call sites -- that is,
when lldb is unwinding a frame in the middle of the stack. It
cannot be used for the currently executing frame; it has no information
about prologues/epilogues/etc.

rdar://problem/12062336

Details

Committed
jmolendaMay 24 2016, 9:20 PM
Parents
rL270657: Reduce code duplication.
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