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[ClangExpressionParser] Add ClangDeclVendor

Authored by xiaobai on Aug 20 2019, 11:47 AM.

Description

[ClangExpressionParser] Add ClangDeclVendor

Summary:
This introduces a layer between DeclVendor and the currently implemented
DeclVendors (ClangModulesDeclVendor and AppleObjCDeclVendor). This
allows the removal of DeclVendor::GetImporterSource which is extremely
clang-specific, freeing up the interface to be more general.

A good follow up to this would be to remove the remaining instances of
clang in DeclVendor, either by moving things to ClangDeclVendor or by
using wrappers (e.g. CompilerDecl instead of clang::NamedDecl).

Differential Revision: https://reviews.llvm.org/D66451

llvm-svn: 369424

Details