libphobos: Add D support for S/390 Linux

libphobos: Add D support for S/390 Linux

gcc/d/ChangeLog:

2019-04-23  Iain Buclaw  <ibuclaw@gdcproject.org>
	    Robin Dapp  <rdapp@linux.ibm.com>

	* typeinfo.cc (create_typeinfo): Write typeinfo flags as uint.

gcc/testsuite/ChangeLog:

2019-04-23  Iain Buclaw  <ibuclaw@gdcproject.org>
	    Robin Dapp  <rdapp@linux.ibm.com>

	* gdc.dg/link.d: Test if target d_runtime.
	* gdc.dg/runnable.d: Fix tests to work on BigEndian.
	* gdc.dg/simd.d: Likewise.

libphobos/ChangeLog:

2019-04-23  Iain Buclaw  <ibuclaw@gdcproject.org>
	    Robin Dapp  <rdapp@linux.ibm.com>

	* configure.tgt: Add s390*-linux* as a supported target.
	* libdruntime/gcc/sections/elf_shared.d: import gcc.builtins.
	(__tls_get_addr_internal): Declare.
	(TLS_DTV_OFFSET): Define as zero on SystemZ.
	(getTLSRange): Support getting TLS on SystemZ.
	* testsuite/libphobos.typeinfo/struct-align.d: New test.

Co-Authored-By: Robin Dapp <rdapp@linux.ibm.com>
From-SVN: r270523