Revert experimental lambda feature.

This is a revert of the following changes :

30c475a2.
lambda: Minor capture-variable/liberate-variable clean-up after post-merge reviews.

6918bf13.
lambda: Experimental support for capture-variable and liberate-variable

fc1ccd74.
lambda: Infrastructure to support capture/liberate-variable dex opcodes

e2facc5b.
runtime: Add lambda box/unbox object equality

2ee54e24.
runtime: Partially implement box-lambda and unbox-lambda experimental opcodes

158f35c9.
interpreter: Add experimental lambda opcodes for invoke/create-lambda

a3bb7203.
Added format 25x to dexdump(2).

Plus surrounding cleanups.

Test: make test-art
Change-Id: Ic6f999ad17385ef933f763641049cf721510b202