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The lldb unwinder can now use the unwind information from the compact-unwind

Description

The lldb unwinder can now use the unwind information from the compact-unwind
section for x86_64 and i386 targets on Darwin systems. Currently only the
compact unwind encoding for normal frame-using functions is supported but it
will be easy handle frameless functions when I have a bit more free time to
test it. The LSDA and personality routines for functions are also retrieved
correctly for functions from the compact unwind section.

This new code is very fresh -- it passes the lldb testsuite and I've done
by-hand inspection of many functions and am getting correct behavior for all
of them. There may need to be some bug fixing over the next couple weeks as
I exercise and test it further. But I think it's fine right now so I'm
committing it.

rdar://problem/13220837

Details

Committed
jmolendaDec 7 2014, 7:09 PM
Parents
rL223624: Revert a part of r223583, for now. It seems causing different emission between…
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