[Webkit-unassigned] [Bug 244540] New: [Xcode] Simplify sanitizer builds

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=244540

            Bug ID: 244540
           Summary: [Xcode] Simplify sanitizer builds
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ddkilzer at webkit.org
                CC: ap at webkit.org, emw at apple.com

Simplify sanitizer builds when using Xcode.

Instead of specifying a path to an xcconfig file from the Tools folder when building, use the ENABLE_*_SANITIZER Xcode variables to modify options during a build.

This change is functionally equivalent to the old xcconfig files, except that WK_ASAN_DISALLOWED can't be used to disable ASan when building host-side tools.  (Previously, the xcconfig files from Tools were the "layer" that turned on the ENABLE_*_SANITIZER macros, but this model assumes those macros are enabled in the `xcodebuild` command, which can't be overridden to my knowledge.)

Also, in order to support overriding of the compiler optimization level, all GCC_OPTIMIZATION_LEVEL variables in Base.xcconfig files need to be changed to use GCC_OPTIMIZATION_LEVEL_OVERRIDE_NO instead, but a new style checker is introduced to remind folks when changing these variables.

<rdar://98015260>

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