[Webkit-unassigned] [Bug 142633] New: LLInt's inline cache should use StructureID instead of Structure*.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=142633

            Bug ID: 142633
           Summary: LLInt's inline cache should use StructureID instead of
                    Structure*.
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Macintosh Intel
                OS: Mac OS X 10.10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jray319 at gmail.com

Initially discussed here:
https://lists.webkit.org/pipermail/webkit-dev/2015-March/027294.html

LLInt's inline cache seems to be left out when refactoring JSCell to have 32-bit StructureID. LLInt's inline cache is currently using Structure* even in 64-bit platforms where StructureID is uint32_t so that it requires an extra load to retrieve Structure*. Note that there is no such indirection in 32-bit platform where StructureID is typedef'ed as Structure*.
This patch is to change LLInt's inline cache to use StructureID, and it will mostly affect 64-bit platform and remove unnecessary loads in LLInt's inline cache.

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