D front-end changes:

 - Backported built-in function handling from upstream.

 - Added new intrinsic `byteswap(ushort)`.

Druntime changes:

 - Update intrinsic modules core.bitop, core.checkedint, core.simd,
   core.vararg, and core.volatile.

 - Backport platform-specific fixes for runtime modules core.cpuid,
   core.internal.traits, and rt.lifetime.

 - Backport openbsd fixes for core.stdc.stdio.

 - Backport solaris fixes for core.sys.posix.locale, and
   core.thread.osthread (PR98910).

gcc/d/ChangeLog:

	* dmd/MERGE: Merge upstream dmd 46133f761.
	* d-builtins.cc (d_build_builtins_module): Set builtins as BUILTINgcc.
	(maybe_set_builtin_1): Likewise.
	* d-frontend.cc (eval_builtin): Adjust condition for early return.
	* intrinsics.cc (maybe_set_intrinsic): Set intrinsics as BUILTINgcc.
	(maybe_expand_intrinsic): Add case for INTRINSIC_BSWAP16.
	* intrinsics.def (INTRINSIC_BT): Update signature.
	(INTRINSIC_BT64): Likewise.
	(INTRINSIC_BSWAP16): New intrinsic.
	(INTRINSIC_VLOAD8): Update module.
	(INTRINSIC_VLOAD16): Likewise.
	(INTRINSIC_VLOAD32): Likewise.
	(INTRINSIC_VLOAD64): Likewise.
	(INTRINSIC_VSTORE8): Likewise.
	(INTRINSIC_VSTORE16): Likewise.
	(INTRINSIC_VSTORE32): Likewise.
	(INTRINSIC_VSTORE64): Likewise.
	(INTRINSIC_ADDS): Update signature.
	(INTRINSIC_ADDSL): Likewise.
	(INTRINSIC_ADDU): Likewise.
	(INTRINSIC_ADDUL): Likewise.
	(INTRINSIC_SUBS): Likewise.
	(INTRINSIC_SUBSL): Likewise.
	(INTRINSIC_SUBU): Likewise.
	(INTRINSIC_SUBUL): Likewise.
	(INTRINSIC_MULS): Likewise.
	(INTRINSIC_MULSL): Likewise.
	(INTRINSIC_MULU): Likewise.
	(INTRINSIC_MULUI): Likewise.
	(INTRINSIC_MULUL): Likewise.
	(INTRINSIC_NEGS): Likewise.
	(INTRINSIC_NEGSL): Likewise.

libphobos/ChangeLog:

	PR d/98910
	* libdruntime/MERGE: Merge upstream druntime 0fd4364c.
	* libdruntime/Makefile.am (DRUNTIME_DSOURCES): Add core/volatile.d.
	* libdruntime/Makefile.in: Regenerate.
	* testsuite/libphobos.allocations/tls_gc_integration.d: Update test.

gcc/testsuite/ChangeLog:

	* gdc.dg/intrinsics.d: Update test.