[ASTImporter][ASTImporterSpecificLookup] Add test for different operators
[ASTImporter][ASTImporterSpecificLookup] Add test for different operators

Summary:
This is to check that operators are handled properly in
`ASTImporterSpecificLookup`.  Note, this lookup table is not used in LLDB, only
in CTU.

Reviewers: a_sidorin, shafik, a.sidorin

Subscribers: rnkovacs, dkrupp, Szelethus, gamesh411, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D57905

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@353505 91177308-0d34-0410-b5e6-96231b3b80d8

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