David Goldman 805f7a4fa4 [clang] Add ObjCProtocolLoc to represent protocol references ...

Add `ObjCProtocolLoc` which behaves like `TypeLoc` but for
`ObjCProtocolDecl` references.

RecursiveASTVisitor now synthesizes `ObjCProtocolLoc` during traversal
and the `ObjCProtocolLoc` can be stored in a `DynTypedNode`.

In a follow up patch, I'll update clangd to make use of this
to properly support protocol references for hover + goto definition.

Differential Revision: https://reviews.llvm.org/D119363

2022-02-18 15:24:00 -05:00

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