Bug 1928676 - Part 2: Use GCPtr instead of HeapPtr in RegExpShared r=sfink

Differential Revision: https://phabricator.services.mozilla.com/D227952

js/src/vm/RegExpShared.h

@@ -85,7 +85,7 @@ class RegExpShared
   friend class RegExpZone;
 
   struct RegExpCompilation {
-    HeapPtr<jit::JitCode*> jitCode;
+    GCPtr<jit::JitCode*> jitCode;
     ByteCode* byteCode = nullptr;
 
     bool compiled(CodeKind kind = CodeKind::Any) const {