HostEnsureCanCompileStrings definition mismatch about html HOT 5 OPEN

I was planning on updating the HTML spec after my changes that got merged in ecma262, but I ended up waiting given that that host hook's signature might change soon again.

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The CSP spec includes a link to tc39/ecma262#938 which explains the missing source in the hook. However, the current state only includes the parameter strings as a list with the body string, rather than the compiled source string which CSP currently requires.

However, if tc39/ecma262#3294 is accepted then the ECMA definition will change again and pass through the compiled string (along with certain other parameters that will be needed).

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Duplicate of #4501 (see also #271)?

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Not quite a duplicate that issue is linked to a change to ecmascript that never happened. (I would personally close that other one out as it's going to be outdated compared to the latest state of TT)

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#271 while relevant doesn't include the EnsureCSPDoesNotBlockStringCompilation changes specifically (unless I'm mistaken)

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