[llvm-install-name-tool] Add -V flag

[alexander-shaposhnikov]

Summary

This diff adds -V alias for --version to make llvm-install-name-tool consistent with other tools (llvm-objcopy, llvm-strip, etc).

Test plan: make check-all

[MaskRay]

LGTM.

llvm/tools/llvm-objcopy/InstallNameToolOpts.td

36

(Alias may not need a line wrap)

[jhenderson]

LGTM too. I noticed that --version (and -V) are missing from the Command Guide for llvm-install-name-tool, along with --help, unlike e.g. llvm-objcopy. Perhaps worth a separate patch if you get a few minutes to fix the doc.

llvm/test/tools/llvm-objcopy/tool-version.test

 # RUN: llvm-objcopy --version | FileCheck --check-prefix=OBJCOPY %s
 # RUN: llvm-objcopy -V | FileCheck --check-prefix=OBJCOPY %s
 
 # RUN: llvm-strip --version | FileCheck --check-prefix=STRIP %s
 # RUN: llvm-strip -V | FileCheck --check-prefix=STRIP %s
 
 # RUN: llvm-install-name-tool --version | FileCheck %s
+# RUN: llvm-install-name-tool -V | FileCheck %s
 
 # OBJCOPY-DAG: {{ version }}
 # OBJCOPY-DAG: GNU objcopy
 
 # STRIP-DAG: {{ version }}
 # STRIP-DAG: GNU strip
 
 # CHECK: {{ version }}

llvm/tools/llvm-objcopy/InstallNameToolOpts.td

 def id : Option<["-","--"], "id", KIND_SEPARATE>,
                  HelpText<"Change dynamic shared library id">;
 
 def change: MultiArg<["-", "--"], "change", 2>,
             HelpText<"Change dependent shared library install name">;
 
 def version : Flag<["--"], "version">,
               HelpText<"Print the version and exit.">;
+
+def V : Flag<["-"], "V">,
+        Alias<version>,
+        HelpText<"Alias for --version">;