Check FastInstance() early for special getters and setters.

Perform the FastInstance() check for getters and setters
when they are detected by the inliner. This will help avoid
the FastInstance() check for inlining.

We also record the field offset and whether the field is
volatile and whether the method is static for use when
inlining or generating the special accessors.

Change-Id: I3f832fc9ae263883b8a984be89a3b7793398b55a