[Webkit-unassigned] [Bug 190317] New: performJITMemcpy() should handle the case when the executable allocator is not initialized yet.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190317

            Bug ID: 190317
           Summary: performJITMemcpy() should handle the case when the
                    executable allocator is not initialized yet.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mark.lam at apple.com

When SeparatedWXHeaps is in use, jitWriteThunkGenerator() will call performJITMemcpy() to copy memory before the JIT fixed memory pool is initialize.  Before r236864, performJITMemcpy() would just do a memcpy in that case.  We need to restore the equivalent behavior.

<rdar://problem/45039398>

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