Ensure large Smi-only arrays don't transition to FAST_DOUBLE_ARRAY

test/mjsunit/regress/regress-1849.js

Index: test/mjsunit/regress/regress-1849.js
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+// Copyright 2009 the V8 project authors. All rights reserved.

[Jakob Kummerow, 2011/12/29 15:18:41]

2011

[danno, 2011/12/30 14:12:02]

Done.

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+// See: http://code.google.com/p/v8/issues/detail?id=1878
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+// Flags: --allow-natives-syntax

[Jakob Kummerow, 2011/12/29 15:18:41]

--smi-only-arrays ? And then you'll need to put the assertion behind an if()
that checks if the flag is in effect.

[danno, 2011/12/30 14:12:02]

See the other comment. 
On 2011/12/29 15:18:41, Jakob wrote:

+
+var count = 1e5;
+var arr = new Array(count);
+assertFalse(%HasFastDoubleElements(arr));
+for (var i = 0; i < count; i++) {
+  arr[i] = 0;
+}
+assertFalse(%HasFastDoubleElements(arr));
+assertTrue(%HasFastSmiOnlyElements(arr));