[MoarVM Bump] Brings 8 commits

MoarVM bump brought: MoarVM/MoarVM@2018.10-82-g9468b7f...2018.10-90-g0939a10cd
0939a10cd Merge branch 'exprjit_09_20_18'
7a110b711 Add hllboolfor exprjit template
9b2ab1690 Add radix_I exprjit template
0accc8ce7 Add coerce_* exprjit templates
5167d1026 Add extend_{u,i}* exprjit templates
43c5cd4aa Add mul exprjit op to documentation
0c2b13a23 Add exprjit integer multiplication op
d40bac9f0 Use arithmetic right shift in JIT of brshift_i

tools/build/MOAR_REVISION

@@ -1 +1 @@
-2018.10-82-g9468b7f
+2018.10-90-g0939a10cd