[OCaml] Rename link_modules' to link_modules

Commit 434e956 renamed link_modules to link_modules' for unclear reasons.
Based on the commit's diff, the author possibly intended to have two
functions, link_modules to bind to LLVMLinkModules and link_modules' to
bind to LLVMLinkModules2. However, there is only one function. link_modules'
appears in LLVM 3.8 onwards.

Differential Revision: https://reviews.llvm.org/D153090

Author: alan-j-hu

llvm/bindings/ocaml/linker/llvm_linker.ml

@@ -10,5 +10,5 @@ exception Error of string
 
 let () = Callback.register_exception "Llvm_linker.Error" (Error "")
 
-external link_modules' : Llvm.llmodule -> Llvm.llmodule -> unit
-                       = "llvm_link_modules"
+external link_modules : Llvm.llmodule -> Llvm.llmodule -> unit
+                      = "llvm_link_modules"

llvm/bindings/ocaml/linker/llvm_linker.mli

@@ -13,6 +13,6 @@
 
 exception Error of string
 
-(** [link_modules' dst src] links [src] into [dst], raising [Error]
+(** [link_modules dst src] links [src] into [dst], raising [Error]
     if the linking fails. The src module is destroyed. *)
-val link_modules' : Llvm.llmodule -> Llvm.llmodule -> unit
+val link_modules : Llvm.llmodule -> Llvm.llmodule -> unit

llvm/test/Bindings/OCaml/linker.ml

@@ -43,18 +43,18 @@ let test_linker () =
 
   let m1 = make_module "one"
   and m2 = make_module "two" in
-  link_modules' m1 m2;
+  link_modules m1 m2;
   dispose_module m1;
 
   let m1 = make_module "one"
   and m2 = make_module "two" in
-  link_modules' m1 m2;
+  link_modules m1 m2;
   dispose_module m1;
 
   let m1 = make_module "one"
   and m2 = make_module "one" in
   try
-    link_modules' m1 m2;
+    link_modules m1 m2;
     failwith "must raise"
   with Error _ ->
     dispose_module m1