Merge bleeding edge up to 9192 into the GC branch.

test/mjsunit/regress/regress-94425.js

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-// Tests the handling of multiple assignments to the same property in a 
-// constructor that only has simple this property assignments.
+// Flags: --expose-gc
 
-function Node() {
-  this.a = 1;
-  this.a = 2;
-  this.a = 3;
-}
+var N = 2040 - 2 + 10;
+var arr = new Array(N);
 
-var n1 = new Node();
-assertEquals(3, n1.a);
+gc();
+gc();
+gc();
 
-var n2 = new Node();
-assertEquals(3, n2.a);
+// arr is in the large object space now.
+// Write new space object into it.
+arr[arr.length - 2] = new Object;
+
+// Shift array multiple times to ensure that young
+// object crosses region boundary.
+for (var i = 0; i < 9; i++) arr.shift();
+
+// Do a GC to verify region dirty marks.
+gc();