Bug#851371: libllvm3.9-dbg: lots of "Could not find DWO" and "in read in psymtab, but not in symtab" warnings

[Rebecca N. Palmer]

It happens every time I run something that uses it in gdb, including 
LLVM's own executables; do you mean it doesn't for you?

$ sudo apt-get install gdb libllvm3.9-dbg llvm-3.9
$ gdb llvm-link-3.9
[...]
(gdb) run
Starting program: /usr/bin/llvm-link-3.9
warning: Could not find DWO CU 
CMakeFiles/LLVMSupport.dir/APFloat.cpp.dwo(0x7c87b0db7d3d4058) 
referenced by CU at offset 0x0 [in module 
/usr/lib/debug/.build-id/ba/46ea8b237c3239edf83c2033c3cd7ab15c0452.debug]
[...]
(amd64, sid cowbuilder chroot)