Merged r16205, r16220, r16237, r16249, r16262, r16269, r16273 into 3.20 branch.

Merged r16205, r16220, r16237, r16249, r16262, r16269, r16273 into 3.20 branch.

Mark HStringCompareAndBranch as potentially causing GCs.

Prevent empty handle dereference in Runtime_InternalNumberFormat.

Fix null handle deref in InternalDateFormat

Fix a bug in Div when all uses are truncating

Fix "Hole" leak in TryBuildConsolidatedElementLoad

Never clear debug-stub call ICs. Make a clear distinction between is_debug_stub used everywhere but the debugger, and IsDebugBreak, used by the debugger.

Fix deoptimization bug, where recursive call can frighten and confuse the unwitting, simple, poor caveman that is Runtime_NotifyDeoptimized.

BUG=chromium:274438, chromium:275467, 274164
R=yangguo@chromium.org

Committed: http://code.google.com/p/v8/source/detail?r=16426

[Yang, 2013-08-29 13:09:23]

On 2013/08/29 13:07:00, Jakob wrote:

rubberstamped lgtm.

[Jakob Kummerow, 2013-08-29 13:19:08]

Committed patchset #1 manually as r16426 (presubmit successful).