stage2 大量优化代码使其自举编译时间大幅缩短

stage2/ast2ir.spl

@@ -6,7 +6,7 @@
 
 type .{ .Error } = @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 .{ .hash_usize, .eq_usize } = @import("utils/hash.spl");
@@ -54,8 +54,8 @@ owned: Vec, // ByteBuffer：为 dbg.panic 消息提供稳定存储
 // ---- 小工具 ----
 
 fn list_at(v: Vec, i: usize): usize {
-    match Vec.get(&v, i) { .Ok(p) => { ret (p as *usize).*; }, .Err(e) => { ret 0; } }
-    ret 0;
+    if i >= v.len { ret 0; }
+    ret ((v.data as *usize) + i).*;
 }
 
 fn push_u(v: *Vec, x: usize) {
@@ -2069,7 +2069,7 @@ fn new(builder: *IrBuilder, sema: *Sema, diag: *Diag): Ast2Ir {
         .ir = builder,
         .ast = sema.ast,
         .def2ir_map = Map.new(@sizeof(usize), @alignof(usize), @sizeof(usize), @alignof(usize),
-                              hash_usize, eq_usize),
+                              hash_kind_usize()),
         .loop_stack = Vec.blank(@sizeof(LoopCtx), @alignof(LoopCtx)),
         .defer_stack = Vec.blank(@sizeof(usize), @alignof(usize)),
         .cur_ret_lang = 0,