zig cc: Add support for -z

This is only the first step; it makes zig cc recognize -z and append it to the linker args, but the linker arg parsing doesn't support -z yet so it will just give the warning 'unsupported linker arg: -z'

src-self-hosted/clang_options_data.zig

@@ -4255,7 +4255,14 @@ flagpd1("fno-whole-file"),
 flagpd1("fwhole-program"),
 flagpd1("fno-whole-program"),
 flagpd1("whyload"),
-sepd1("z"),
+.{
+    .name = "z",
+    .syntax = .separate,
+    .zig_equivalent = .linker_input_z,
+    .pd1 = true,
+    .pd2 = false,
+    .psl = false,
+},
 joinpd1("fsanitize-undefined-strip-path-components="),
 joinpd1("fopenmp-cuda-teams-reduction-recs-num="),
 joinpd1("analyzer-config-compatibility-mode="),

src-self-hosted/stage2.zig

@@ -1290,6 +1290,7 @@ pub const ClangArgIterator = extern struct {
         rtti,
         no_rtti,
         for_linker,
+        linker_input_z,
     };
 
     const Args = struct {

src/main.cpp

@@ -737,6 +737,10 @@ static int main0(int argc, char **argv) {
                 case Stage2ClangArgForLinker:
                     linker_args.append(buf_create_from_str(it.only_arg));
                     break;
+                case Stage2ClangArgLinkerInputZ:
+                    linker_args.append(buf_create_from_str("-z"));
+                    linker_args.append(buf_create_from_str(it.only_arg));
+                    break;
             }
         }
         // Parse linker args

src/stage2.h

@@ -350,6 +350,7 @@ enum Stage2ClangArg {
     Stage2ClangArgRtti,
     Stage2ClangArgNoRtti,
     Stage2ClangArgForLinker,
+    Stage2ClangArgLinkerInputZ,
 };
 
 // ABI warning

tools/update_clang_options.zig

@@ -90,6 +90,10 @@ const known_options = [_]KnownOpt{
         .name = "for-linker=",
         .ident = "for_linker",
     },
+    .{
+        .name = "z",
+        .ident = "linker_input_z",
+    },
     .{
         .name = "E",
         .ident = "preprocess",