Use Token::isOneOf method in Parser.
Use Token::isOneOf method in Parser.

Summary: Easier to read and possibly optimize.

Reviewers: rsmith, sepavloff

Reviewed By: sepavloff

Subscribers: sepavloff, cfe-commits

Differential Revision: https://reviews.llvm.org/D36701

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@325352 91177308-0d34-0410-b5e6-96231b3b80d8

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