[PATCH] D50953: [clang-tidy] Handle sugared reference types in ExprMutationAnalyzer

[Shuai Wang via Phabricator via cfe-commits]

shuaiwang created this revision.
shuaiwang added reviewers: aaron.ballman, alexfh.
Herald added subscribers: cfe-commits, Szelethus, a.sidorin, xazax.hun.
Herald added a reviewer: george.karpenkov.

This handles cases like this:

  typedef int& IntRef;
  void mutate(IntRef);
  void f() {
    int x;
    mutate(x);
  }

where the param type is a sugared type (`TypedefType`) instead of a
reference type directly.

Note that another category of similar but different cases are already
handled properly before:

  typedef int Int;
  void mutate(Int&);
  void f() {
    int x;
    mutate(x);
  }


Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D50953

Files:
  clang-tidy/utils/ExprMutationAnalyzer.cpp
  unittests/clang-tidy/ExprMutationAnalyzerTest.cpp

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