[Webkit-unassigned] [Bug 135423] New: Allow high fidelity type profiling to be enabled and disabled.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=135423

           Summary: Allow high fidelity type profiling to be enabled and
                    disabled.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: sbarati at apple.com
                CC: fpizlo at apple.com


Currently, the VM has little flexibility in whether it enables/disables type profiling. 
It either enables or disables type profiling based on a runtime flag in JSC::Options. 
This patch will provide the necessary infrastructure that enables type profiling to be 
turned on and off dynamically. Once it can be enabled/disabled dynamically, the Inspector can 
present a UI for showing type profiling because it can call into JSC to enable/disable type profiling. 
This will allow us to integrate type profiling in the WebKit nightly builds sooner because  the 
various opcodes do not need to be fully implemented in all tiers of the JIT.

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