Add dg-final option-based target selectors

This patch adds target selectors of the form:

  { any-opts "opt1" ... "optn" }
  { no-opts "opt1" ... "optn" }

for skipping or xfailing tests based on compiler options.  It only
works for dg-final selectors.

The patch then uses no-opts to exclude -O0 and (sometimes) -Og from
some guality.exp xfails.  AFAICT (based on gcc-testresults) these
tests pass for those options for all targets.

gcc/
	* doc/sourcebuild.texi: Document no-opts and any-opts target
	selectors.

gcc/testsuite/
	* lib/target-supports-dg.exp (selector_expression): Handle any-opts
	and no-opts.
	* gcc.dg/guality/pr41353-1.c: Exclude -O0 from xfail.
	* gcc.dg/guality/pr59776.c: Likewise.
	* gcc.dg/guality/pr54970.c: Likewise -O0 and -Og.

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