Moved RangedConstraintManager header to the StaticAnalyser include dir

Summary:
Moved `RangedConstraintManager` header from  `lib/StaticAnalyzer/Core/` to `clang/StaticAnalyzer/Core/PathSensitive/`. No changes to the code.

Reviewers: NoQ, george.karpenkov, dcoughlin

Reviewed By: george.karpenkov

Subscribers: NoQ, george.karpenkov, dcoughlin, ddcc

Differential Revision: https://reviews.llvm.org/D47640

llvm-svn: 333862