[analyzer][NFC] Tease apart and clang-format NoStoreFuncVisitor
[analyzer][NFC] Tease apart and clang-format NoStoreFuncVisitor

Make several methods static functions
Move non-trivial methods out-of-line
Add a divider
Turn non-obvious autos into Optional<RegionVector>
clang-format affected lines

Differential Revision: https://reviews.llvm.org/D63086

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@363509 91177308-0d34-0410-b5e6-96231b3b80d8

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