use Base.IncludeInto for _include (#31)

This does not change any behavior on JL side, but this is necessary to
allow JET to analyze JL (although we still need to add a JET-specific
handling for `JS.register_kinds!` to make JL actually analyzable by
JET).

Author: aviatesk

src/JuliaLowering.jl

@@ -4,7 +4,7 @@ baremodule JuliaLowering
 using Base
 # We define a separate _include() for use in this module to avoid mixing method
 # tables with the public `JuliaLowering.include()` API
-_include(path::AbstractString) = Base.include(JuliaLowering, path)
+const _include = Base.IncludeInto(JuliaLowering)
 using Core: eval
 
 using JuliaSyntax

src/kinds.jl

@@ -1,4 +1,3 @@
-
 # The following kinds are used in intermediate forms by lowering but are not
 # part of the surface syntax
 function _register_kinds()