[testsuite] xfail target-specific asms, & gcov

[Nathan Sidwell]

I couldn't figure out a way to have a scan-assembler check be specific to a 
particular target and xfailed.  It appeared one could have one or the other, but 
not both.

this patch extends scan-assembler (and scan-assembler-not) to allow something like:
/* { dg-final { scan-assembler "\\.hidden\t__gcov___ZN1X4FinkEv" { target { ! 
*-*-darwin* } } { xfail *-*-* } } } */

If there's already a way to do this, I'm all ears.

The other part of the patch allows gcov tests to be xfailed, both the gcov 
processing itself, and individual line counts.  It appears that there used to be 
some support for this, but it had severely bit rotted.  For instance one will be 
able to append { xfail ... } to a count(...) line.

The goal of these patches is so I can xfail some of the recent gcov tests I've 
added when I revert part of the changes that are causing the problem left in 
PR51113.  That defect is showing that a deeper analysis is needed.  While I'm 
doing that, it'd be good to unbreak things even if it means losing some of the 
new feature I attempted to add.

ok?

nathan
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