0.9.9.36:

0.9.9.36:
	Merge Cyrus Harmon's 7th gencgc merge candidate
	... with the addition of idempotent implementations of
		arch_clear_pseudo_atomic_interrupted() for
		sparc, mips, alpha and hppa.  (the last three completely
		untested).
	... many, many changes, most of which are documented in
		doc/internals-notes/GENCGC-PORTING-NOTES

	(This commit may break horribly.  Please read, please test)