[Analyzer] Iterator Checker - Part 8: Support for assign, clear, insert,...

[Analyzer] Iterator Checker - Part 8: Support for assign, clear, insert, emplace and erase operations

This patch adds support for the following operations in the iterator checkers: assign, clear, insert, insert_after, emplace, emplace_after, erase and erase_after. This affects mismatched iterator checks ("this" and parameter must match) and invalidation checks (according to the standard).

Differential Revision: https://reviews.llvm.org/D32904

llvm-svn: 341794