[Webkit-unassigned] [Bug 277902] New: [GCC] Add custom implementation of std::bit_cast for systems not supporting it

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=277902

            Bug ID: 277902
           Summary: [GCC] Add custom implementation of std::bit_cast for
                    systems not supporting it
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dpino at igalia.com

Changeset 281895 at main introduced a non-conditional use of `std::bit_cast`. This broke the build for many Linux systems lacking support for this function.

https://build.webkit.org/#/builders/992/builds/4591/steps/9/logs/stdio

```
/home/buildbot/worker/GTK-Linux-64-bit-Release-Debian-11-Build/build/Source/WTF/wtf/Float16.h:59:36: error: no member named 'bit_cast' in namespace 'std'
    return static_cast<float>(std::bit_cast<_Float16>(h));
```

`std::bit_cast` is implemented since libstdc++-11, so Linux systems still using libstdc++-10 are affected by this build break. Switching the compiler to clang doesn't solve this issue since the version of libstdc++ distributed in the OS is still used (in fact, Debian 11 bot is already using clang).

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