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[clang-format/ObjC] Use getIdentifierInfo() instead of tok::identifier

Description

[clang-format/ObjC] Use getIdentifierInfo() instead of tok::identifier

Summary:
Previously, we checked tokens for tok::identifier to see if they
were identifiers inside an Objective-C selector.

However, this missed C++ keywords like new and delete.

To fix this, this diff uses getIdentifierInfo() to find
identifiers or keywords inside Objective-C selectors.

Test Plan: New tests added. Ran tests with:

% make -j16 FormatTests && ./tools/clang/unittests/Format/FormatTests

Reviewers: djasper, jolesiak

Reviewed By: djasper

Subscribers: klimek, cfe-commits

Differential Revision: https://reviews.llvm.org/D46143

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