Reland 2 "Keep a canonical list of shared function infos."

test/mjsunit/regress/regress-existing-shared-function-info.js

Index: test/mjsunit/regress/regress-existing-shared-function-info.js
diff --git a/test/mjsunit/compiler/regress-469089.js b/test/mjsunit/regress/regress-existing-shared-function-info.js
similarity index 54%
copy from test/mjsunit/compiler/regress-469089.js
copy to test/mjsunit/regress/regress-existing-shared-function-info.js
index 6aff2b720305290570124cec0dd7a4a959f05694..a53014c0340386233b1eaa557ebb7bca8752962b 100644
--- a/test/mjsunit/compiler/regress-469089.js
+++ b/test/mjsunit/regress/regress-existing-shared-function-info.js
@@ -4,13 +4,15 @@
 
 // Flags: --expose-gc
 
-(function() {
-  var __v_6 = false;
-  function f(val, idx) {
-    if (idx === 1) {
-      gc();
-      __v_6 = (val === 0);
-    }
+function f() {
+  return function g() {
+    return function h() {}
   }
-  f(.1, 1);
-})();
+}
+
+var h = f()();
+
+// Make sure code has been flushed.
+for (var i of Array(10)) gc();
+
+f()();