<rdar://problem/11537498>

Fixed an issue with the symbol table parsing of files that have STAB entries in them where there are two N_SO entries where the first has a directory, and the second contains a full path:

[     0] 00000002 64 (N_SO         ) 00     0000   0000000000000000 '/Volumes/data/src/'
[     1] 0000001e 64 (N_SO         ) 00     0000   0000000000000000 '/Volumes/data/src/Source/main.m'
[     2] 00000047 66 (N_OSO        ) 09     0001   000000004fc642d2 '/tmp/main.o'
[     3] 00000001 2e (N_BNSYM      ) 01     0000   0000000000003864
[     4] 000000bd 24 (N_FUN        ) 01     0000   0000000000003864 '_main'
[     5] 00000001 24 (N_FUN        ) 00     0000   00000000000000ae
[     6] 00000001 4e (N_ENSYM      ) 01     0000   00000000000000ae
[     7] 00000001 64 (N_SO         ) 01     0000   0000000000000000

We now correctly combine entries 0 and 1 into a single entry.

llvm-svn: 157712