<rdar://problem/14717184>

LLDB needs in memory module load level settings to control how much information is read from memory when loading in memory modules. This change adds a new setting:

(lldb) settings set target.memory-module-load-level [minimal|partial|complete]

minimal will load only sections (no symbols, or function bounds via function starts or EH frame)
partial will load sections + bounds
complete will load sections + bounds + symbols
Fixed a problem where "image lookup -t" was printing
a bunch of semicolons where the IndirectFieldDecls
were.  These IndirectFieldDecls should have been
implicit.

<rdar://problem/14628784>