Introducing llvm-libtool-darwin

This diff starts the implementation of llvm-libtool-darwin
(an llvm based replacement of cctool's libtool).
Libtool is used for creating static and dynamic libraries
from a bunch of object files given as input.

Reviewed by alexshap, smeenai, jhenderson, MaskRay

Differential Revision: https://reviews.llvm.org/D82923
diff --git a/llvm/docs/CommandGuide/index.rst b/llvm/docs/CommandGuide/index.rst
index 77fece0..d13c2a0 100644
--- a/llvm/docs/CommandGuide/index.rst
+++ b/llvm/docs/CommandGuide/index.rst
@@ -14,25 +14,26 @@
 .. toctree::
    :maxdepth: 1
 
-   llvm-as
-   llvm-dis
-   opt
+   dsymutil
    llc
    lli
-   llvm-link
-   llvm-lib
-   llvm-lipo
+   llvm-as
    llvm-config
+   llvm-cov
    llvm-cxxmap
    llvm-diff
-   llvm-cov
+   llvm-dis
+   llvm-dwarfdump
+   llvm-lib
+   llvm-libtool-darwin
+   llvm-link
+   llvm-lipo
+   llvm-mca
    llvm-profdata
+   llvm-readobj
    llvm-stress
    llvm-symbolizer
-   llvm-dwarfdump
-   dsymutil
-   llvm-mca
-   llvm-readobj
+   opt
 
 GNU binutils replacements
 ~~~~~~~~~~~~~~~~~~~~~~~~~