[LLVMdev] Checking llvm-config status code

[Yuri Gribov]

Ok guys,

Here is the patch (I also had to update lib/CompilerDriver/Makefile
because it tries to run llvm-config without building it!).

I checked that build works and errors in llvm-config are properly
detected. Could someone verify and commit it? I do not have write
access to svn (how can I get one BTW?).

-Yuri Gribov
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