Intrinsic functions: Don't repeat the parameter list in the preamble (1)

The clause that defines an intrinsic function
(other than an acccessor function)
gives its parameter list in the clause heading.
Often, the preamble re-states the parameter list.
This commit (and the next) deletes those repeats.

(See Issue tc39#2576 for justification.)

In this commit, we handle all the simple cases
where nothing is lost by deleting the repeat.