1) a DeclContext doesn't need to be passed in, now that IdentifierType tracks it.
2) factor the code that sets Components to ErrorType out of the clients.
Swift SVN r5250
by the SIL parser. Add a test that covers both local types, and types
that require looking through an import decl (Int, from the stdlib).
Swift SVN r5249
"a tuple type specifying the type of a global must explicitly state the type of each tuple element".
This diagnostic doesn't make any sense, and is apparently only generated by the old
type checker. It is also the only thing keeping the "isFirstPass" argument to
TC.validateType() alive, so remove it.
The new type checker does have issues with default values, I filed
rdar://13946171 to track it, but this old approach (which I wrote, *shame*)
seems way too broken to salvage.
Swift SVN r5244
have been simplified. This still isn't ideal, but is a lot better than
what we had, and is waiting for SILFunctionTypeInfo to stop containing
SILTypes.
Swift SVN r5232
