[llvm-install-name-tool] Adds docs for llvm-install-name-tool

Adding documentation for llvm-install-name-tool.

Reviewed by smeenai, Ktwu

Differential Revision: https://reviews.llvm.org/D81944

docs/CommandGuide/index.rst

@@ -44,6 +44,7 @@ GNU binutils replacements
    llvm-addr2line
    llvm-ar
    llvm-cxxfilt
+   llvm-install-name-tool
    llvm-nm
    llvm-objcopy
    llvm-objdump

docs/CommandGuide/llvm-install-name-tool.rst

@@ -0,0 +1,51 @@
+llvm-install-name-tool - LLVM tool for manipulating install-names and rpaths
+============================================================================
+
+.. program:: llvm-install-name-tool
+
+SYNOPSIS
+--------
+
+:program:`llvm-install-name-tool` [*options*] *input*
+
+DESCRIPTION
+-----------
+
+:program:`llvm-install-name-tool` is a tool to manipulate dynamic shared library
+install names and rpaths listed in a Mach-O binary.
+
+For most scenarios, it works as a drop-in replacement for Apple's
+:program:`install_name_tool`.
+
+OPTIONS
+--------
+At least one of the following options are required, and some options can be
+combined with other options:
+
+.. option:: -add_rpath <rpath>
+
+ Add an rpath named ``<rpath>`` to the specified binary. Can be specified multiple
+ times to add multiple rpaths. Throws an error if ``<rpath>`` is already listed in
+ the binary.
+
+.. option:: -delete_rpath <rpath>
+
+ Delete an rpath named ``<rpath>`` from the specified binary. Can be specified multiple
+ times to delete multiple rpaths. Throws an error if ``<rpath>`` is not listed in
+ the binary.
+
+EXIT STATUS
+-----------
+
+:program:`llvm-install-name-tool` exits with a non-zero exit code of 1 if there is an error.
+Otherwise, it exits with code 0.
+
+BUGS
+----
+
+To report bugs, please visit <https://bugs.llvm.org/>.
+
+SEE ALSO
+--------
+
+:manpage:`llvm-objcopy(1)`