[PATCH] [Sema] Re-land "Make FunctionType's TSI use unadjusted argument types"

[Richard Smith]

On Tue, Jun 11, 2013 at 3:24 PM, Eli Friedman <eli.friedman at gmail.com> wrote:
> On Tue, Jun 11, 2013 at 3:09 PM, Reid Kleckner <rnk at google.com> wrote:
>>
>> For a Type held by an AST node, I completely agree, and I'll try to
>> address that.  For a type held by a TypeSourceInfo, I disagree, the
>> FunctionProtoType should really hold the undecayed parameter types.
>
>
> Hmm... I was thinking more along the lines of keeping around the un-decayed
> type, but automatically decaying it for the user of the API unless they
> explicitly request the un-decayed version.  I'm not sure I like keeping
> different versions of the type in the AST nodes vs. TypeSourceInfo.

I have an alternative suggestion: introduce a DecayedType sugar node,
which is canonically the decayed pointer type, but also provides
access to the undecayed (array or function) type.