[PATCH] D158872: [clang][ASTMatchers] Add a few type-related Matchers

[Ding Fei via Phabricator via cfe-commits]

danix800 added a comment.

In D158872#4622124 <https://reviews.llvm.org/D158872#4622124>, @aaron.ballman wrote:

> Are these matchers going to be used in-tree (by clang-tidy, or something else)? We typically do not add new AST matches until there's a need for them because the AST matchers have a pretty big impact on build times of Clang itself.

They are used in `ASTImporter` testcases as shown in https://reviews.llvm.org/D158948. Though this might not be a strong reason to
add these matchers and bring on too much bad impact.

ASTImporter is more urgent since we still lack support for some of the AST nodes so I considered adding them batchly and started with
type-related nodes. I thought that matchers're OK to use in unittests as actually they are used a lot there, but I wasn't aware of the impact
on build of Clang.

If not acceptable, I'm OK with it. We can still test importing with other ways. Matchers are not mandatory.


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https://reviews.llvm.org/D158872