* configure.ac: Add --enable-indirect-function option.

	* configure.ac: Add --enable-indirect-function option.
	* config.gcc: Add default_gnu_indirect_function.
	* config.in (HAVE_GAS_INDIRECT_FUNCTION): Rename to ...
	(HAVE_GNU_INDIRECT_FUNCTION): ... this.
	* varasm.c (do_assemble_alias): Adjust for macto name change.
	* configure: Rebuilt.
	* doc/install.texi: Document --enable-indirect-function.

	testsuite/
	* lib/target-supports-dg.exp (dg-require-ifunc): Remove extraneous
	alias checking.
	* lib/target-supports.exp (check_ifunc_available): Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@164725 138bc75d-0d04-0410-961f-82ee72b054a4