clang: parse --verbose flag as -v

src/clang_options_data.zig

@@ -2031,7 +2031,7 @@ flagpsl("MT"),
 .{
     .name = "verbose",
     .syntax = .flag,
-    .zig_equivalent = .other,
+    .zig_equivalent = .verbose,
     .pd1 = false,
     .pd2 = true,
     .psl = false,

tools/update_clang_options.zig

@@ -272,6 +272,10 @@ const known_options = [_]KnownOpt{
         .name = "v",
         .ident = "verbose",
     },
+    .{
+        .name = "verbose",
+        .ident = "verbose",
+    },
     .{
         .name = "L",
         .ident = "lib_dir",