parloops: Copy target and optimizations when creating a function clone

SVE simd clones require to be compiled with a SVE target enabled or the argument
types will not be created properly. To achieve this we need to copy
DECL_FUNCTION_SPECIFIC_TARGET from the original function declaration to the
clones.  I decided it was probably also a good idea to copy
DECL_FUNCTION_SPECIFIC_OPTIMIZATION in case the original function is meant to
be compiled with specific optimization options.

gcc/ChangeLog:

	* tree-parloops.cc (create_loop_fn): Copy specific target and
	optimization options to clone.