stage2 大量优化代码使其自举编译时间大幅缩短

stage2/sema.spl

@@ -9,7 +9,7 @@
 
 type .{ .Error, .Status } = @import("utils/error.spl");
 type .{ .Vec } = @import("utils/vec.spl");
-type .{ .Map } = @import("utils/map.spl");
+type .{ .Map, .hash_kind_usize } = @import("utils/map.spl");
 type .{ .ByteView } = @import("utils/byte_view.spl");
 type .{ .ByteBuffer } = @import("utils/byte_buffer.spl");
 type .{ .append_usize } = @import("utils/fmt.spl");
@@ -69,11 +69,8 @@ type SemaResult = enum {
 // ---- 小工具 ----
 
 fn list_at(v: Vec, i: usize): usize {
-    match Vec.get(&v, i) {
-        .Ok(ptr) => { ret (ptr as *usize).*; },
-        .Err(error) => { ret 0; },
-    }
-    ret 0;
+    if i >= v.len { ret 0; }
+    ret ((v.data as *usize) + i).*;
 }
 
 fn push_u(v: *Vec, x: usize) {
@@ -234,7 +231,7 @@ fn new(ast: *Ast, diag: *Diag): SemaResult {
         .current_loop_break_tid = 0,
         .label_stack = Vec.blank(@sizeof(ByteView), @alignof(ByteView)),
         .ir_to_lang = Map.new(@sizeof(usize), @alignof(usize), @sizeof(usize), @alignof(usize),
-                              hash_usize, eq_usize),
+                              hash_kind_usize()),
     };
     ret .Ok(s);
 }