Build: fix UAF of step names

lib/std/Build/Step.zig

@@ -95,7 +95,7 @@ pub fn init(options: StepOptions) Step {
 
     return .{
         .tag = options.tag,
-        .name = arena.dupe(u8, options.name) catch @panic("OOM"),
+        .name = options.owner.graph.dupeString(options.name),
         .owner = options.owner,
         .dependencies = .empty,
         .max_rss = options.max_rss,

lib/std/Build/Step/CheckFile.zig

@@ -41,5 +41,5 @@ pub fn create(owner: *std.Build, file: std.Build.LazyPath, options: Options) *Ch
 }
 
 pub fn setName(check_file: *CheckFile, name: []const u8) void {
-    check_file.step.name = name;
+    check_file.step.name = check_file.step.owner.graph.dupeString(name);
 }

lib/std/Build/Step/Run.zig

@@ -241,7 +241,7 @@ pub fn create(owner: *std.Build, name: []const u8) *Run {
 }
 
 pub fn setName(run: *Run, name: []const u8) void {
-    run.step.name = name;
+    run.step.name = run.step.owner.graph.dupeString(name);
     run.rename_step_with_output_arg = false;
 }
 

test/tests.zig

@@ -2502,7 +2502,7 @@ pub fn addStandaloneTests(
         .simple_skip_release_small = mem.findScalar(OptimizeMode, optimize_modes, .small) == null,
     });
     const test_cases_dep_step = test_cases_dep.builder.default_step;
-    test_cases_dep_step.name = b.graph.dupeString(test_cases_dep_name);
+    test_cases_dep_step.name = test_cases_dep_name;
     step.dependOn(test_cases_dep.builder.default_step);
     return step;
 }