Hopefully fix the build for people with ocaml.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72254 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/bindings/ocaml/llvm/llvm.ml b/bindings/ocaml/llvm/llvm.ml
index a3a614d..c8862b1 100644
--- a/bindings/ocaml/llvm/llvm.ml
+++ b/bindings/ocaml/llvm/llvm.ml
@@ -249,6 +249,7 @@
 external const_vector : llvalue array -> llvalue = "llvm_const_vector"
 
 (*--... Constant expressions ...............................................--*)
+external align_of : lltype -> llvalue = "LLVMAlignOf"
 external size_of : lltype -> llvalue = "LLVMSizeOf"
 external const_neg : llvalue -> llvalue = "LLVMConstNeg"
 external const_not : llvalue -> llvalue = "LLVMConstNot"