[NQP Bump] 8469ed1 [MoarVM Bump] Brings 15 commits

NQP bump brought: Raku/nqp@2018.06-157-g295a580...2018.06-158-g8469ed1

MoarVM bump brought: MoarVM/MoarVM@2018.06-399-g4fc267b...2018.06-414-gb7ffccf
b7ffccf ensure returning NULL from these.
1bfc6c2 silence compiler warning
f5b2202 up to double-devirt assign_[ins] and decont_[ins]
37b7c7b discover facts about a bunch of sp_guard ops
1347a94 output name&cuuid in spesh slots for code objects
554fe42 Don't add base index when looking for lexical type
fba5c6b Harden BB deletion annotation motion
68b3197 Fix uninitialized memory in extops info
1a22aaa Copy facts when splitting SSA versions
431f33e Update the test register in plugins
004d2f3 Missing call to MVMVECTOR_INIT
6e7b215 Update spesh plugin guard insertion
a7a2ca6 Allow getting a new version of an in-use temp
b9ffe79 Implement SSA split; restore speculative args opt
5bcae47 Start splitting SSA versions at guards

tools/build/NQP_REVISION

@@ -1 +1 @@
-2018.06-157-g295a580
+2018.06-158-g8469ed1