Rename static analyzer namespace 'GR' to 'ento'.

include/clang/Analysis/DomainSpecific/CocoaConventions.h

include/clang/GR/AnalysisConsumer.h

include/clang/GR/BugReporter/BugReporter.h

include/clang/GR/BugReporter/BugType.h

include/clang/GR/BugReporter/PathDiagnostic.h

include/clang/GR/Checkers/DereferenceChecker.h

include/clang/GR/Checkers/LocalCheckers.h

include/clang/GR/FrontendActions.h

include/clang/GR/ManagerRegistry.h

include/clang/GR/PathDiagnosticClients.h

include/clang/GR/PathSensitive/AnalysisManager.h

include/clang/GR/PathSensitive/BasicValueFactory.h

include/clang/GR/PathSensitive/BlockCounter.h

include/clang/GR/PathSensitive/Checker.h

include/clang/GR/PathSensitive/CheckerHelpers.h

include/clang/GR/PathSensitive/CheckerVisitor.h

include/clang/GR/PathSensitive/ConstraintManager.h

include/clang/GR/PathSensitive/CoreEngine.h

include/clang/GR/PathSensitive/Environment.h

include/clang/GR/PathSensitive/ExplodedGraph.h