[patch] Add a simple test of line numbers in the g++ debug info

[Jeffrey Yasskin]

Jason pointed out a simpler way to do this with -dA and
scan-assembler, so here's a new patch that takes that approach. Tested
on Linux and Darwin.

gcc/testsuite/ChangeLog:
2010-07-19  Jeffrey Yasskin  <jyasskin@google.com>

        * lib/scanasm.exp (dg-function-on-line): Test that a function
is defined on the current line.
        * g++.dg/debug/dwarf2/lineno-simple1.C: New. Line number sanity test.
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