ARM: JSR 292 MethodHandle support

[Andrew Haley]

This is a patch against http://icedtea.classpath.org/hg/release/icedtea7-forest-2.1/hotspot

It adds support for the various MethodHandle::invoke methods,
MethodHandle constants, and the invokedynamic opcode.  The JIT mostly
falls back to the interpreter for support, but ldc MethodHandle is
handled in the case where it's already resolved.

Zero's support for MethodHandles is incomplete, so some tests will
still fail.  Once Zero is complete, we can revisit the JIT with a mind
to speeding-up invokedynamic.

I've asked Andrew Dinn to help review this patch.

Andrew.
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