[AST] Squeeze some bits in LinkageComputer::QueryType
[AST] Squeeze some bits in LinkageComputer::QueryType

Replace the pair std::pair<const NamedDecl *, unsigned> where the
unsigned represents an LVComputationKind by a PointerIntPair.
This saves a pointer per entry in the map LinkageComputer::CachedLinkageInfo.

Differential Revision: https://reviews.llvm.org/D52268

Reviewed by: rjmccall, george.burgess.iv, erichkeane



git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@342973 91177308-0d34-0410-b5e6-96231b3b80d8

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