ART: Ignore unneeded environment uses.

Some of the environment uses of primitive-typed values are
not really needed in non-debuggable/non-OSR methods. Ignoring
those uses during liveness analysis significantly reduces the
size of stack maps in the oat file.

Code reduction on arm64:
boot-framework.oat: -1.8%
boot.oat:           -1.4%

Test: 466-get-live-vreg, 564-checker-condition-liveness.
Test: 639-checker-code-sinking.
Test: angler boots to GUI.
Test: test-art-host, test-art-target

Change-Id: I91dcb6d0a8ab86f56c7b243bf9b100f69bcd5979