Refactor some profiling info functions

Deleted profile_compilation_info-inl.h

Added a new helper class MethodHotness to reduce the number of
required getters for reading method hotness, startup, and post
startup booleans.

Test: test-art-host
Bug: 62040831

Change-Id: I799a38e2bea6177ba5816c54524f4ccacedba772