7052782: Two langtools regression tests fail due to fix for 7034977 which removed the invokeGeneric method
Summary: Change the tests to call invoke instead of invokeGeneric
Reviewed-by: jrose, mcimadamore

Reviewed-by: jrose, mcimadamore

6979327: method handle invocation should use casts instead of type parameters to specify return type
Summary: infer return type for polymorphic signature calls according to updated JSR 292 draft
Reviewed-by: jjg
Contributed-by: john.r.rose@oracle.com

Reviewed-by: darcy

Summary: split MethodHandle.invoke into invokeExact and invokeGeneric
Reviewed-by: twisti

Summary: Language changes documented in http://wikis.sun.com/display/mlvm/ProjectCoinProposal
Reviewed-by: jjg, darcy, mcimadamore