d: Merge upstream dmd 2503f17e5, phobos a74fa63e6.

d: Merge upstream dmd 2503f17e5, phobos a74fa63e6.

D front-end changes:

    - Import dmd mainline development.
    - Removed internal d_intN and d_unsN aliases to stdint types, which
      caused a regression on Solaris where int8_t is a char (PR104911).

Phobos changes:

    - Import phobos mainline development.

	PR d/104911

gcc/d/ChangeLog:

	* dmd/MERGE: Merge upstream dmd 2503f17e5.
	* d-convert.cc (convert_expr): Replace d_uns64 with dinteger_t.
	* d-lang.cc: Remove dmd/root/file.h include.
	(d_handle_option): Update for new front-end interface.
	(d_parse_file): Likewise.

libphobos/ChangeLog:

	* src/MERGE: Merge upstream phobos a74fa63e6.