d: Merge upstream dmd cf63dd8e5, druntime caf14b0f, phobos 41aaf8c26.

d: Merge upstream dmd cf63dd8e5, druntime caf14b0f, phobos 41aaf8c26.

D front-end changes:

    - Import dmd v2.099.0-rc.1.
    - The `main' can now return type `noreturn' and supports return
      inference.

D Runtime changes:

    - Import druntime v2.099.0-rc.1.
    - C bindings for stat_t on powerpc-linux has been fixed.

Phobos changes:

    - Import phobos v2.099.0-rc.1.

gcc/d/ChangeLog:

	* d-target.cc (Target::_init): Initialize C type size fields.
	* dmd/MERGE: Merge upstream dmd cf63dd8e5.
	* dmd/VERSION: Update version to v2.099.0-rc.1.

libphobos/ChangeLog:

	* libdruntime/MERGE: Merge upstream druntime caf14b0f.
	* src/MERGE: Merge upstream phobos 41aaf8c26.

gcc/testsuite/ChangeLog:

	* gdc.dg/torture/simd7413a.d: Update.
	* gdc.dg/ubsan/pr88957.d: Update.
	* gdc.dg/simd18489.d: New test.
	* gdc.dg/torture/simd21727.d: New test.