Now in the presence of an Objective-C version 2

runtime, we read method signatures for both class
and instance methods out of the runtime data.

(lldb) fr var str
(NSString *) str = 0x0000000105000180 @"Hello from '/Volumes/Data/projects/lldb/test/lang/objc/foundation/a.out'"
(lldb) expr str.length
(unsigned long long) $0 = 72
(lldb) expr [NSString stringWithCString:"Hello world!" encoding:1]
(id) $1 = 0x0000000105100050
(lldb) po $1
$1 = 0x0000000105100050 Hello world!

(lldb) fr var array1
(NSArray *) array1 = 0x000000010010a6e0 @"3 objects"
(lldb) expr array1.count
(unsigned long long) $0 = 3
(lldb) expr [array1 objectAtIndex:2]
(id) $1 = 0x00000001000025d0
(lldb) po $1
$1 = 0x00000001000025d0 array1 object3

Notice that both regular and property-style notation
work.  I still need to add explicit support for
properties with non-default setters/getters.

This information is only queried if an Objective-C
object does not have debug information for a complete
type available.  Otherwise we query debug information
as usual.

llvm-svn: 164878

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