[Webkit-unassigned] [Bug 253859] New: Add additional STL things to PCH files

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=253859

            Bug ID: 253859
           Summary: Add additional STL things to PCH files
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org

Flamegraphs of the build revealed a few STL headers, and one OS logging header, that are particularly costly. Adding them to our precompiled header set shows a measurable reduction in build time.

Prior to this change:
**** Time summary:
Compilation (10204 times):
  Parsing (frontend):         9250.1 s
  Codegen & opts (backend):   3311.8 s

With this change:
**** Time summary:
Compilation (10202 times):
  Parsing (frontend):         8907.4 s
  Codegen & opts (backend):   3189.9 s

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