libphobos: Merge upstream druntime 2f764ab6

libphobos: Merge upstream druntime 2f764ab6

Fixes hashing of complex reals, enabling testing of rt.util.typeinfo and
core.internal.hash.

Reviewed-on: https://github.com/dlang/druntime/pull/6837

libphobos/ChangeLog:

	* Makefile.in: Rebuild.
	* configure: Rebuild.
	* libdruntime/Makefile.am: Test rt.util.typeinfo and
	core.internal.convert.
	* libdruntime/Makefile.in: Rebuild.
	* src/Makefile.in: Rebuild.
	* testsuite/Makefile.in: Rebuild.
	* testsuite/libphobos.hash/test_hash.d: Update test.

From-SVN: r268755