[NQP Bump] 6c3c3c3 [MoarVM Bump] Brings 17 commits

NQP bump brought: Raku/nqp@2018.06-50-gb1e80f0...2018.06-51-g6c3c3c3

MoarVM bump brought: MoarVM/MoarVM@2018.06-203-g1b1edfe...2018.06-220-gd4d8ff4
d4d8ff4 Mark functions used in Perl 6 extops MVM_PUBLIC
3e91dc6 Fix MVM_GC_DEBUG worklist check for NULL STable
00d5a06 Merge branch 'new-deopt-point-algo'
8821a35 Move speshresolve handling into optimize phase
fc1378a Don't repeatedly calcuate if preds are seen
9154008 Remove leftover debugging code
3345ec3 Fix handling of added deopt points
7bf4c42 Optimize SCRef_gc_mark by using faster MVM_gc_worklist_add calls
787b7bb Value written by deopt instruction also needed
be56234 Switch over to using the new deopt use method
8ac13c2 Optimize VMArray_gc_mark to be a bit faster
6ec6898 Rename VMArray gc_mark to VMArray_gc_mark
d8e1ad9 Fix a crash caused by the previous commit
df0ecf2 Add unseen read handling to new deopt algorithm
e766345 Speed up hash garbage collection a lot (gc_mark); add new macros
5429bf2 Add uthash_types.h to Makefile.in
7e1ab4b Sketch out more precise deopt algorithm

tools/build/NQP_REVISION

@@ -1 +1 @@
-2018.06-50-gb1e80f0
+2018.06-51-g6c3c3c3