Use two LC_NOTE load commands for identifying the main binary that

lldb should use when given a corefile.

This uses an LC_NOTE "main bin spec" or an LC_NOTE "kern ver str"
if they are present in a Mach-O core file.

Core files may have multiple different binaries -- different kernels,
or a mix of user process and kernel binaries -- and it can be
difficult for lldb to detect the correct one to use simply by looking
at the pages of memory.  These two new LC_NOTE load commands allow
for the correct binary to be recorded unambiguously.

<rdar://problem/20878266> 

llvm-svn: 300138

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