d: Merge upstream dmd, druntime 2bbf64907c, phobos b64bfbf91

d: Merge upstream dmd, druntime 2bbf64907c, phobos b64bfbf91

D front-end changes:

    - Import dmd v2.106.0.

D runtime changes:

    - Import druntime v2.106.0.

Phobos changes:

    - Import phobos v2.106.0.

gcc/d/ChangeLog:

	* Make-lang.in (D_FRONTEND_OBJS): Rename d/common-string.o to
	d/common-smallbuffer.o.
	* dmd/MERGE: Merge upstream dmd 2bbf64907c.
	* dmd/VERSION: Bump version to v2.106.0.
	* modules.cc (layout_moduleinfo_fields): Update for new front-end
	interface.
	(layout_moduleinfo): Likewise.

libphobos/ChangeLog:

	* libdruntime/MERGE: Merge upstream druntime 2bbf64907c.
	* src/MERGE: Merge upstream phobos b64bfbf91.