test(zigux): add lane16 findNextAndBit replay runner

zigux/tests/phase1_find_next_and_bit_bench_replay_build.zig

@@ -0,0 +1,39 @@
+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    const root_module = b.createModule(.{
+        .root_source_file = b.path("phase1_find_next_and_bit_bench_replay.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+    const find_bit_module = b.createModule(.{
+        .root_source_file = b.path("../../tools/lib/find_bit.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    root_module.addImport("find_bit", find_bit_module);
+
+    const replay_tests = b.addTest(.{
+        .name = "phase1-find-next-and-bit-bench-replay",
+        .root_module = root_module,
+    });
+    const run_replay = b.addRunArtifact(replay_tests);
+
+    const replay_step = b.step(
+        "phase1-find-next-and-bit-bench-replay",
+        "Run the focused Phase 1 findNextAndBit bench replay from zigux/tests",
+    );
+    replay_step.dependOn(&run_replay.step);
+
+    const test_step = b.step(
+        "test",
+        "Run the focused Phase 1 findNextAndBit bench replay from zigux/tests",
+    );
+    test_step.dependOn(&run_replay.step);
+
+    b.default_step.dependOn(test_step);
+}