[llvm-symbolizer] Add back --version and add a -v alias

The switch from llvm::cl to OptTable (D83530) dropped --version, which
is needed by some users.

This patch also adds a -v alias, which is available in GNU addr2line.

The version dumping is similar to llvm-objcopy --version (exotic):

```
llvm-symbolizer
LLVM (http://llvm.org/):
  LLVM version 12.0.0git
  Optimized build with assertions.
  Default target: x86_64-unknown-linux-gnu
  Host CPU: skylake-avx512
```

Reviewed By: dyung, jhenderson

Differential Revision: https://reviews.llvm.org/D85624

llvm/docs/CommandGuide/llvm-symbolizer.rst

@@ -346,7 +346,7 @@ OPTIONS
       Line: 15
       Column: 0
 
-.. option:: --version
+.. option:: --version, -v
 
   Print version information for the tool.
 

llvm/test/tools/llvm-symbolizer/version.test

@@ -0,0 +1,8 @@
+# RUN: llvm-symbolizer --version | FileCheck %s --check-prefixes=SYMBOLIZER,COMMON
+# RUN: llvm-symbolizer -v | FileCheck %s --check-prefixes=SYMBOLIZER,COMMON
+# RUN: llvm-addr2line --version | FileCheck %s --check-prefixes=ADDR2LINE,COMMON
+# RUN: llvm-addr2line -v | FileCheck %s --check-prefixes=ADDR2LINE,COMMON
+
+# SYMBOLIZER: llvm-symbolizer{{$}}
+# ADDR2LINE:  llvm-addr2line{{$}}
+# COMMON: LLVM version {{.*}}

llvm/tools/llvm-symbolizer/Opts.td

@@ -43,6 +43,7 @@ def relativenames : F<"relativenames", "Strip the compilation directory from pat
 defm untag_addresses : B<"untag-addresses", "", "Remove memory tags from addresses before symbolization">;
 def use_native_pdb_reader : F<"use-native-pdb-reader", "Use native PDB functionality">;
 def verbose : F<"verbose", "Print verbose line info">;
+def version : F<"version", "Display the version">;
 
 def : Flag<["-"], "a">, Alias<addresses>, HelpText<"Alias for --addresses">;
 def : F<"print-address", "Alias for --addresses">, Alias<addresses>;
@@ -58,6 +59,7 @@ def : Flag<["-"], "i">, Alias<inlines>, HelpText<"Alias for --inlines">;
 def : F<"inlining", "Alias for --inlines">, Alias<inlines>;
 def : Flag<["-"], "p">, Alias<pretty_print>, HelpText<"Alias for --pretty-print">;
 def : Flag<["-"], "s">, Alias<basenames>, HelpText<"Alias for --basenames">;
+def : Flag<["-"], "v">, Alias<version>, HelpText<"Alias for --version">;
 
 // Compatibility aliases for old asan_symbolize.py and sanitizer binaries (before 2020-08).
 def : Flag<["--"], "inlining=true">, Alias<inlines>, HelpText<"Alias for --inlines">;

llvm/tools/llvm-symbolizer/llvm-symbolizer.cpp

@@ -190,9 +190,8 @@ static void symbolizeInput(const opt::InputArgList &Args, uint64_t AdjustVMA,
     outs() << "\n";
 }
 
-static void printHelp(bool IsAddr2Line, const SymbolizerOptTable &Tbl,
+static void printHelp(StringRef ToolName, const SymbolizerOptTable &Tbl,
                       raw_ostream &OS) {
-  StringRef ToolName = IsAddr2Line ? "llvm-addr2line" : "llvm-symbolizer";
   const char HelpText[] = " [options] addresses...";
   Tbl.PrintHelp(OS, (ToolName + HelpText).str().c_str(),
                 ToolName.str().c_str());
@@ -203,6 +202,7 @@ static void printHelp(bool IsAddr2Line, const SymbolizerOptTable &Tbl,
 static opt::InputArgList parseOptions(int Argc, char *Argv[], bool IsAddr2Line,
                                       StringSaver &Saver,
                                       SymbolizerOptTable &Tbl) {
+  StringRef ToolName = IsAddr2Line ? "llvm-addr2line" : "llvm-symbolizer";
   Tbl.setGroupedShortOptions(true);
   // The environment variable specifies initial options which can be overridden
   // by commnad line options.
@@ -217,7 +217,12 @@ static opt::InputArgList parseOptions(int Argc, char *Argv[], bool IsAddr2Line,
   if (HasError)
     exit(1);
   if (Args.hasArg(OPT_help)) {
-    printHelp(IsAddr2Line, Tbl, outs());
+    printHelp(ToolName, Tbl, outs());
+    exit(0);
+  }
+  if (Args.hasArg(OPT_version)) {
+    outs() << ToolName << '\n';
+    cl::PrintVersionMessage();
     exit(0);
   }