[PATCH] Handle properly somewhat special cases of -main-file-name

[Lubos Lunak]

 The handling of -main-file-name in CGDebugInfo::CreateCompileUnit() can 
result in incorrect DW_AT_name in somewhat special cases:

1)
$ touch /tmp/a.cpp
$ 
clang++ -Wall -c /tmp/a.cpp -g -o /tmp/a.o -Xclang -main-file-name -Xclang /new/path/a.cpp
$ readelf -wi /tmp/a.o | grep DW_AT_name
    <12>   DW_AT_name        : (indirect string, offset: 
0x15): /tmp/new/path/a.cpp

2)
$ touch /tmp/a.cpp
$ cd /
$ cat /tmp/a.cpp | clang++ -Wall -x 
c++ -c - -g -o /tmp/a.o -Xclang -main-file-name -Xclang a.cpp
$ readelf -wi /tmp/a.o | grep DW_AT_name
    <12>   DW_AT_name        : (indirect string, offset: 0x15): /a.cpp

 The attached patch fixes those. Ok to commit?

-- 
 Lubos Lunak
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