Migrated several tests from blink to V8 repository.

test/webkit/dfg-constant-fold-uncaptured-variable-that-is-later-captured.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 // 1.  Redistributions of source code must retain the above copyright
 //     notice, this list of conditions and the following disclaimer.
 // 2.  Redistributions in binary form must reproduce the above copyright
 //     notice, this list of conditions and the following disclaimer in the
 //     documentation and/or other materials provided with the distribution.
 //
 // THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
 // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 // DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 // DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 // (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 // ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 description(
-"Tests the behavior of Array.prototype.concat while the array is having a bad time due to one of the elements we are concatenating."
+"Tests that constant folding an access to an uncaptured variable that is captured later in the same basic block doesn't lead to assertion failures."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+var thingy = 456;
 
+function bar() {
+    return thingy;
+}
 
+function baz(a) {
+    if (a) // Here we have an access to r2. The bug was concerned with our assertions thinking that this access was invalid.
+        return arguments; // Force r2 (see below) to get captured.
+}
+
+function foo(p, a) {
+    // The temporary variable corresponding to the 'bar' callee coming out of the ternary expression will be allocated by
+    // the bytecompiler to some virtual register, say r2. This expression is engineered so that (1) the virtual register
+    // chosen for the callee here is the same as the one that will be chosen for the first non-this argument below,
+    // (2) that the callee ends up being constant but requires CFA to prove it, and (3) that we actually load that constant
+    // using GetLocal (which happens because of the CheckFunction to check the callee).
+    var x = (a + 1) + (p ? bar : bar)();
+    // The temporary variable corresponding to the first non-this argument to baz will be allocated to the same virtual
+    // register (i.e. r2).
+    return baz(x);
+}
+
+for (var i = 0; i < 100; ++i)
+    shouldBe("foo(true, 5)[0]", "462");