Add UncheckedInterfaceProvider interface for nodes that can give an unchecked hint about the interface type they are likely to return. Use it in MethodCallTargetNode to attempt single-implementor checkcast based devirtualization.

os_family = bsd

arch = sparc

arch_model = sparc

os_arch = bsd_sparc

os_arch_model = bsd_sparc

lib_arch = sparcv9

compiler = gcc

sysdefs = -D_ALLBSD_SOURCE -D_GNU_SOURCE -DSPARC