Merge pull request #180 from bdw/master

Add force_gc to MoarVM backend

Author: jnthn

src/vm/moar/HLL/Backend.nqp

@@ -11,7 +11,7 @@ class HLL::Backend::MoarVM {
     }
 
     method force_gc() {
-        nqp::die("Cannot force GC on Moar backend yet");
+        nqp::force_gc();
     }
 
     method name() {

src/vm/moar/QAST/QASTOperationsMAST.nqp

@@ -2589,6 +2589,9 @@ QAST::MASTOperations.add_core_moarop_mapping('continuationinvoke', 'continuation
 QAST::MASTOperations.add_core_moarop_mapping('mvmstartprofile', 'startprofile', 0);
 QAST::MASTOperations.add_core_moarop_mapping('mvmendprofile', 'endprofile');
 
+# MoarVM-specific GC ops
+QAST::MASTOperations.add_core_moarop_mapping('force_gc', 'force_gc');
+
 sub resolve_condition_op($kind, $negated) {
     return $negated ??
         $kind == $MVM_reg_int64 ?? 'unless_i' !!