Correct Volatile SGET/SPUT format tag, add missing cases for JIT

Correct Volatile SGET/SPUT format tag, add missing cases for JIT

Fix for http://b/issue?id=2971877, which was identified via
debug tracing on http://b/issue?id=2971569.  There were a couple
of problems: first, the volatile sget/sput byte codes had the
wrong format tag (22c instead of 21c).  Second, the JIT was missing
a couple of case statments to handle these.  As far as the JIT goes,
this would not have caused correctness problems, but would have
been slower than necessary.

Change-Id: I57a41c4e063642b0c19acba5bb0855dd8ce2d4ba