[Webkit-unassigned] [Bug 206036] New: [WTF] Make MediaTime constructor constexpr

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=206036

            Bug ID: 206036
           Summary: [WTF] Make MediaTime constructor constexpr
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Template Framework
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aboya at igalia.com

https://bugs.webkit.org/show_bug.cgi?id=205723 allowed to declare
MediaTime variables as static inside functions without needing a
global destructor.

It did not eliminate the call to the MediaTime constructor on runtime
though. This wasn't a problem for static variables inside functions,
as the compiler adds a guard variable to call the constructor the
first time the function is called.

On the other hand, for variables defined outside of the scope of the
function, for them to be initialized the MediaTime constructor would
have to be called at runtime from a global constructor, something
we're trying to avoid and which generates an error in clang.

But again, MediaTime is a simple class with only integral values, we
shouldn't need a runtime function call to initialize it!

This patch makes the MediaTime constructor constexpr so that we don't
need runtime initialization for static MediaTime variables. This
allows us to declare them outside functions and enables the compiler
to generate code without guard variables when static MediaTime
variables are declared inside functions.

A test has been added accessing a global const static MediaTime. The
build should not produce any error stating the need for a global
constructor.

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