tree 9a8a195874fa634b5c0c0ad1ae3bbb67a6c9eda7
parent 1cb04d79350b31190d2e39ced700d31a7faf1004
author Jason Molenda <jmolenda@apple.com> 1323754778 +0000
committer Jason Molenda <jmolenda@apple.com> 1323754778 +0000

When unwinding from the first frame, try to ask the remote debugserver
if this is a mapped/executable region of memory.  If it isn't, we've jumped
through a bad pointer and we know how to unwind the stack correctly based
on the ABI.  

Previously I had 0x0 special cased but if you jumped to 0x2 on x86_64 one
frame would be skipped because the unwinder would try using the x86_64 
ArchDefaultUnwindPlan which relied on the rbp.

Fixes <rdar://problem/10508291>


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@146477 91177308-0d34-0410-b5e6-96231b3b80d8