Refactor LLInt::Data::performAssertions() into assertInvariants().

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Mark Lam]

The intent of LLInt::Data::performAssertions() was to assert some invariants that cannot be expressed as static_asserts, or did not have a convenient place to express the static_asserts because they are about constants used in the LLInt asm files.  These asserts need only be executed once.  At the time, I added a call to performAssertions() from the VM constructor.  The better place to call it would be from JSC::initialize(), which is only executed once per process.

Additionally, over time, we started using this function to assert other invariants.  Hence, we should rename it and put it in a place not associated with the LLInt specifically.

Lastly, replace all uses of the antiquated STATIC_ASSERT macro with static_assert.

[Radar WebKit Bug Importer]

<rdar://problem/128746336>

[Mark Lam]

Pull request: https://github.com/WebKit/WebKit/pull/29121

[EWS]

Committed 279327@main (491e7dba5234): <https://commits.webkit.org/279327@main>

Reviewed commits have been landed. Closing PR #29121 and removing active labels.