Bug 1593975 - update linearWeakMarkingDisabled_ to MainThreadOrGCTaskData. r=jonco

Differential Revision: https://phabricator.services.mozilla.com/D51810

UltraBlame original commit: 6922ef47c25721aa5e7bc2a7bed57161a8b0f21e

Author: marco-c

js/src/gc/GCMarker.h

@@ -455,7 +455,7 @@ class GCMarker : public JSTracer {
 
 
 
-  MainThreadData<bool> linearWeakMarkingDisabled_;
+  MainThreadOrGCTaskData<bool> linearWeakMarkingDisabled_;
 
 
   size_t markCount;

js/src/jit-test/tests/gc/bug-1593975.js

@@ -0,0 +1,20 @@
+function runtest(func) {
+    func();
+}
+const g1 = newGlobal({
+    newCompartment: true
+});
+enqueueMark("enter-weak-marking-mode");
+function transplantMarking() {
+    const vals = {};
+    vals.map = new WeakMap();
+    enqueueMark(vals.map);
+    enqueueMark("yield");
+    enqueueMark("enter-weak-marking-mode");
+}
+runtest(transplantMarking);
+egc = 60;
+gcslice(egc * 100);
+try {
+x();
+} catch(e) {}