MethodHandles: Implement revealDirect / reflectAs.

The implementation approach is straightforward - we materialize
a Constructor, Field or Method (subclasses of Member) from the
handle's ArtField or ArtMethod pointer, and implement
MethodHandleInfo API in terms of that Member.

We need special casing for a few things :
- The "type" of the MethodHandleInfo is not the same of the type
  of the handle it was derived from, so adjustments are necessary.
- revealDirect is only supposed to work with "direct" handles, but
  our Constructor / VarArgs handling is implemented in terms of
  transformers. We will need to treat those transformer classes as
  direct for all practical purposes.

Test: make test-art-host

Change-Id: I58cd081b7db1f581cfb7e2eb10d0c52308fac5ed

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