Fix the Wyhash implementation

src/core/ByteMap.zig

@@ -39,6 +39,7 @@ table: []Entry,
 table_size: usize,
 
 var collisions: usize = 0;
+var hasher = Wyhash.init(0);
 
 pub fn init(self: *ByteMap, allocator: *Mmap, size_arg: usize) !void {
     self.table_size = try std.math.ceilPowerOfTwo(usize, size_arg);
@@ -57,7 +58,7 @@ pub fn init(self: *ByteMap, allocator: *Mmap, size_arg: usize) !void {
 }
 
 fn get_index(self: *ByteMap, key: []const u8) usize {
-    return std.hash.Wyhash.hash(@intCast(key.len), key) & (self.table_size - 1);
+    return hasher.reset_hash(@intCast(key.len), key) & (self.table_size - 1);
 }
 
 fn find_entry(self: *ByteMap, key: []const u8, comptime insertion: bool) ?*Entry {

src/core/Wyhash.zig

@@ -194,6 +194,17 @@ pub fn hash(self: *Wyhash, input: []const u8) u64 {
     return self.final2();
 }
 
+pub fn reset_hash(self: *Wyhash, seed: u64, input: []const u8) u64 {
+    self.total_len = 0;
+    self.buf_len = 0;
+
+    self.state[0] = seed ^ mix(seed ^ secret[0], secret[1]);
+    self.state[1] = self.state[0];
+    self.state[2] = self.state[0];
+
+    return self.hash(input);
+}
+
 pub fn reset(self: *Wyhash) void {
     self.total_len = 0;
     self.buf_len = 0;