gnu: ocaml-llvm: Move to (gnu packages llvm).

Commit 8f710cc598 introduced a circular
dependency between ocaml.scm and llvm.scm by referring to 'llvm' from
the top level of ocaml.scm.  This fixes it.

* gnu/packages/ocaml.scm (make-ocaml-llvm, ocaml-llvm)
(ocaml-llvm-9, ocaml-llvm-10, ocaml-llvm-11): Move to...
* gnu/packages/llvm.scm: ... here.

gnu/packages/ocaml.scm

@@ -87,7 +87,6 @@
   #:use-module (guix packages)
   #:use-module (guix svn-download)
   #:use-module (guix utils)
-  #:use-module (guix memoization)
   #:use-module ((srfi srfi-1) #:hide (zip)))
 
 ;; A shortcut for files from ocaml forge. Downloaded files are computed from
@@ -6198,47 +6197,3 @@ provides support to program with time varying values: declarative events and
  signals.  React doesn't define any primitive event or signal, it lets the
 client chooses the concrete timeline.")
     (license license:lgpl2.1+)))
-
-(define make-ocaml-llvm
-  ;; Make it a memoizing procedure so its callers below don't end up defining
-  ;; two equal-but-not-eq "ocaml-llvm" packages for the default LLVM.
-  (mlambdaq (llvm)
-    (package
-      (inherit llvm)
-      (name "ocaml-llvm")
-      (outputs '("out"))
-      (arguments
-       `(#:configure-flags
-         (list
-          (string-append "-DLLVM_OCAML_EXTERNAL_LLVM_LIBDIR="
-                         (assoc-ref %build-inputs "llvm") "/lib")
-          "-DBUILD_SHARED_LIBS=TRUE"
-          "-DLLVM_OCAML_OUT_OF_TREE=TRUE"
-          (string-append "-DLLVM_OCAML_INSTALL_PATH="
-                         (assoc-ref %outputs "out") "/lib/ocaml/site-lib"))
-         #:phases
-         (modify-phases %standard-phases
-           (replace 'build
-             (lambda _
-               (invoke "make" "ocaml_all")))
-           (replace 'install
-             (lambda _
-               (invoke "cmake" "-P" "bindings/ocaml/cmake_install.cmake"))))))
-      (inputs
-       `(("llvm" ,llvm)))
-      (native-inputs
-       `(("ocaml" ,ocaml)
-         ("ocaml-findlib" ,ocaml-findlib)
-         ("ocaml-ounit" ,ocaml-ounit)
-         ("python" ,python)))
-      (propagated-inputs
-       `(("ocaml-integers" ,ocaml-integers)
-         ("ocaml-ctypes" ,ocaml-ctypes)))
-      (synopsis "OCaml bindings to LLVM")
-      (description "This package contains the OCaml bindings distributed with
-LLVM."))))
-
-(define-public ocaml-llvm (make-ocaml-llvm llvm))
-(define-public ocaml-llvm-9 (make-ocaml-llvm llvm-9))
-(define-public ocaml-llvm-10 (make-ocaml-llvm llvm-10))
-(define-public ocaml-llvm-11 (make-ocaml-llvm llvm-11))