[analyzer] Remove EndPath function as it is dead code

Summary: -

Reviewers: george.karpenkov

Reviewed By: george.karpenkov

Subscribers: baloghadamsoftware, cfe-commits, xazax.hun, szepet, a.sidorin,
             mikhail.ramalho, Szelethus, donat.nagy, dkrupp

Tags: #clang

Differential Revision: https://reviews.llvm.org/D53720

llvm-svn: 362030