profiler: make sure no scope is exited after prof_enter

exiting that if/else scope caused the profiler to leave
the first frame it entered immediately, making it reach
an odd state where it was writing all of its data into
the void.

src/vm/moar/HLL/Backend.nqp

@@ -71,22 +71,26 @@ class HLL::Backend::MoarVM {
 
         self.ensure_prof_routines();
 
+        my $conf-hash;
+
         if $kind eq "heap" {
             unless $filename {
                 $filename := 'heap-snapshot-' ~ nqp::time_n() ~ '.mvmheap';
             }
-            $prof_start_sub(nqp::hash('kind', $kind, 'path', $filename));
+            $conf-hash := nqp::hash('kind', $kind, 'path', $filename);
         } else {
             unless $filename {
                 $filename := 'profile-' ~ nqp::time_n() ~ '.html';
             }
-            $prof_start_sub(nqp::hash('kind', $kind));
+            $conf-hash := nqp::hash('kind', $kind);
         }
 
         my @END := nqp::gethllsym('perl6', '@END_PHASERS');
         @END.push(-> { self.dump_profile_data($prof_end_sub(), $kind, $filename) })
             if nqp::defined(@END);
 
+        $prof_start_sub($conf-hash);
+
         my $res  := $what();
         unless nqp::defined(@END) {
             my $data := $prof_end_sub();