Load the global proxy from the context of the target function.

test/mjsunit/harmony/proxies-function.js

Index: test/mjsunit/harmony/proxies-function.js
diff --git a/test/mjsunit/harmony/proxies-function.js b/test/mjsunit/harmony/proxies-function.js
index 6b8d098442f16fba27bf4647a8d1b2ddc7e4a377..8c91e9ba9ef12fdec6cbb00b69216b63c6981973 100644
--- a/test/mjsunit/harmony/proxies-function.js
+++ b/test/mjsunit/harmony/proxies-function.js
@@ -53,8 +53,7 @@ var receiver
 
 function TestCall(isStrict, callTrap) {
   assertEquals(42, callTrap(5, 37))
-  // TODO(rossberg): strict mode seems to be broken on x64...
-  // assertSame(isStrict ? undefined : global_object, receiver)
+  assertSame(isStrict ? undefined : global_object, receiver)
 
   var handler = {
     get: function(r, k) {
@@ -67,8 +66,7 @@ function TestCall(isStrict, callTrap) {
 
   receiver = 333
   assertEquals(42, f(11, 31))
-  // TODO(rossberg): strict mode seems to be broken on x64...
-  // assertSame(isStrict ? undefined : global_object, receiver)
+  assertSame(isStrict ? undefined : global_object, receiver)
   receiver = 333
   assertEquals(42, o.f(10, 32))
   assertSame(o, receiver)
@@ -746,3 +744,31 @@ function TestCalls() {
 
 TestCalls()
 */
+
+var realms = [Realm.create(), Realm.create()];
+Realm.shared = {};
+
+Realm.eval(realms[0], "function f() { return this; };");
+Realm.eval(realms[0], "Realm.shared.f = f;");
+Realm.eval(realms[0], "Realm.shared.fg = this;");
+Realm.eval(realms[1], "function g() { return this; };");
+Realm.eval(realms[1], "Realm.shared.g = g;");
+Realm.eval(realms[1], "Realm.shared.gg = this;");
+
+var fp = Proxy.createFunction({}, Realm.shared.f);
+var gp = Proxy.createFunction({}, Realm.shared.g);
+
+for (var i = 0; i < 10; i++) {
+  assertEquals(Realm.shared.fg, fp());
+  assertEquals(Realm.shared.gg, gp());
+
+  with (this) {
+    assertEquals(Realm.shared.fg, fp());
+    assertEquals(Realm.shared.gg, gp());
+  }
+
+  with ({}) {
+    assertEquals(Realm.shared.fg, fp());
+    assertEquals(Realm.shared.gg, gp());
+  }
+}