[PATCH] D85750: [SyntaxTree] Unbox operators into tokens for nodes generated from `CXXOperatorCallExpr`

[Eduardo Caldas via Phabricator via cfe-commits]

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For an user define `<`, `x < y` would yield the syntax tree:

  BinaryOperatorExpression
  |-IdExpression
  | `-UnqualifiedId
  |   `-x
  |-IdExpression
  | `-UnqualifiedId
  |   `-<
  `-IdExpression
    `-UnqualifiedId
      `-y

But there is no syntatic difference at call site between call site or
built-in `<`. As such they should generate the same syntax tree, namely:

  BinaryOperatorExpression
  |-IdExpression
  | `-UnqualifiedId
  |   `-x
  |-<
  `-IdExpression
    `-UnqualifiedId
      `-y


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D85750

Files:
  clang/lib/Tooling/Syntax/BuildTree.cpp
  clang/unittests/Tooling/Syntax/TreeTest.cpp

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