Bug 1522284 - ARM64: record when JitCode is storing nursery pointers. r=sstangl

Differential Revision: https://phabricator.services.mozilla.com/D17655

--HG--
extra : moz-landing-system : lando

js/src/jit/arm64/MacroAssembler-arm64.h

@@ -1842,6 +1842,9 @@ class MacroAssemblerCompat : public vixl::MacroAssembler {
   // load: offset to the load instruction obtained by movePatchablePtr().
   void writeDataRelocation(ImmGCPtr ptr, BufferOffset load) {
     if (ptr.value) {
+      if (gc::IsInsideNursery(ptr.value)) {
+        embedsNurseryPointers_ = true;
+      }
       dataRelocations_.writeUnsigned(load.getOffset());
     }
   }