Varun Gandhi f219e58ada [NFC] Refactor ExtInfo to use a builder-pattern based API. ...

Since the two ExtInfos share a common ClangTypeInfo, and C++ doesn't let us
forward declare nested classes, we need to hoist out AnyFunctionType::ExtInfo
and SILFunctionType::ExtInfo to the top-level.

We also add some convenience APIs on (AST|SIL)ExtInfo for frequently used
withXYZ methods. Note that all non-default construction still goes through the
builder's build() method.

We do not add any checks for invariants here; those will be added later.

2020-07-31 13:55:55 -07:00

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