cglobal: make distinction of pointer vs name a syntactic distinction

[topolarity]

Follow-up to #59165, applying the same semantics to cglobal's first argument.

This PR avoids the route in #61707 and preserves cglobal(x::Ptr, ::Type{T}) semantics. It also does not change how the second-argument (type) is resolved.

The net effect is that the semantics of ccall / cglobal are more similar, and we get to clean up some TODO's and bugs in the compiler that were handling (or not) the exotic non-linearized form of cglobal.

[topolarity]

@nanosoldier runtests()

[maleadt]

@nanosoldier runtests()

[nanosoldier]

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