Properly set ElementsKind of empty FAST_DOUBLE_ELEMENTS arrays when transitioning.

test/mjsunit/regress/regress-117409.js

+// Copyright 2012 the V8 project authors. All rights reserved.
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+
+// Flags: --expose-gc
+
+function KeyedStoreIC(a) { a[0] = Math.E; }
+
+// Create literal with a fast double elements backing store
+var literal = [1.2];
+
+// Specialize the IC for fast double elements
+KeyedStoreIC(literal);
+KeyedStoreIC(literal);
+
+// Trruncate array to 0 elements, at which point backing store will be replaced
+// with empty fixed array.
+literal.length = 0;
+
+// ArrayPush built-in will replace empty fixed array backing store with 19
+// elements fixed array backing store.  This leads to a mismatch between the map
+// and the backing store.  Debug mode will crash here in set_elements accessor.
+literal.push(Math.E, Math.E);
+
+// Corrupt the backing store!
+KeyedStoreIC(literal);
+
+// Release mode will crash here when trying to visit parts of E as pointers.
+gc();