swift234

Move 'mutating' and 'nonmutating' onto the new attribute processing machinery.
Also:
 - merge the test/decl/func/functions_new.swift testcase into test/Sema/immutability.swift,
   where the bulk of similar tests are.
 - Move the type checking logic for 'dynamic' out of ValidateAttrs into TypeCheckAttrs
 - Change the encoding for 'override' to 49 so that stuff vbr's so much more densely :-)




Swift SVN r20006