Inliner refactoring: consolidate logging, reporting and dumping

Inliner refactoring: consolidate logging, reporting and dumping

With this change the responsibility for dumping, logging, and reporting
inline decisions is moved into the JitInlineResult class instead of being
distributed throughout the code base. This insures all the relevant inline
information is handled in a consistent manner.

The JitInlineResult is updated to hold a compiler instance and now
requires a context string describing the what the jit is doing as it evaluates
an inline candidate. There are 4 distinct contexts in use currently.