[NQP Bump] Brings 2 commits

NQP bump brought: Raku/nqp@2018.03-40-gb73a9b6...2018.03-42-g0d344c2
0d344c2 [MoarVM Bump] Brings 21 commits
ab5dec0 Fix bug with iteration of empty character class

MoarVM bump brought: MoarVM/MoarVM@2018.03-35-gafdcad4...2018.03-56-g85fc758
85fc758 Missing write barrier enforcement in CStruct
ce38e35 Fix missing GC mark of deserializer contexts list
df4c94c Spot use of an item already put in a gen2 freelist
6ba2d8d Simplify rooting by using MVMROOT2
be3ef87 Add missing MVMROOTing of a frame
a7bb6f0 Use FSA for all_scs list
47a5203 Rename mutex for more clarity over what it covers
9a8d2fc Merge pull request #814 from jstuder-gh/sig_hash_3
5d5c500 Sig shifting macro; Protect against subtle errors
35b3e3a Re-run update_ops for new getsignals op mapping
f1edbe0 Register sig_hash as an Instance root
b0fe1ef Merge remote-tracking branch 'origin/master' into sig_hash_3
a5c2e82 Revert "Map getsignals op via update_ops"
c4daa74 Guard against negative and zero signals
69140ba Modify as suggested in code-review: jnthn++
2ebf594 Fix Win build; num SIG_WANTED elems explicit
a73069d Fix initial declarations in loop; Not in C89
631db88 Map getsignals op via update_ops
ca7f24c Populate valid_sigs flag set handler fn if not set
830b734 Create bit-flag to indicate signals found on host
a5f5ca9 Create getsignals op to query for valid sigs

tools/build/NQP_REVISION

@@ -1 +1 @@
-2018.03-40-gb73a9b6
+2018.03-42-g0d344c2