tree-prof.exp: Check for -fprofile-generate support.

tree-prof.exp: Check for -fprofile-generate support.

 gcov-profile/48845
	* g++.dg/tree-prof/tree-prof.exp: Check for -fprofile-generate
	support.
	* gcc.dg/matrix/matrix.exp: Likewise.
	* gcc.dg/tree-prof/tree-prof.exp: Likewise.
	* lib/target-supports-dg.exp (dg-require-profiling): Don't pass
	line number to check_profiling_available.
	* lib/target-supports.exp (check_profiling_available): Account for
	this.
	Require TLS runtime support with -fprofile-generate.
	* lib/profopt.exp (profopt-execute): Add TLS options for
	-fprofile-generate.
	* gcc.dg/pr47793.c: Add dg-require-profiling "-fprofile-generate".

From-SVN: r174275