[PATCH gdb-10] Fix crash when expanding partial symtabs with DW_TAG_imported_unit

[Tom Tromey]

>>>>> "Simon" == Simon Marchi via Gdb-patches <gdb-patches@sourceware.org> writes:

Simon> I glanced over the test, I don't fully understand it.  But the fix looks
Simon> good to me for gdb-10-branch, it's not really risky.

I'm going to check it in on the branch and pull the test cases to git
trunk now.  Thanks.

Tom