[Webkit-unassigned] [Bug 143422] New: Return Optional<uint32_t> from PropertyName::asIndex

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=143422

            Bug ID: 143422
           Summary: Return Optional<uint32_t> from PropertyName::asIndex
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: utatane.tea at gmail.com

Spawn from https://bugs.webkit.org/show_bug.cgi?id=140426.
To re-land https://bugs.webkit.org/show_bug.cgi?id=140426, we first extract simple refactoring patch from the target issue.

In this patch, change return value of asIndex from uint32_t to Optional<uint32_t>.

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