wasm: add basic debuginfo through name section (#18130)

vlib/wasm/functions.v

@@ -1,34 +1,46 @@
+// Copyright (c) 2023 l-m.dev. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
 module wasm
 
 struct ImportCallPatch {
 	mod  string
 	name string
-	pos  int
+mut:
+	pos int
 }
 
 struct FunctionCallPatch {
 	name string
-	pos  int
+mut:
+	pos int
 }
 
 type CallPatch = FunctionCallPatch | ImportCallPatch
 
 struct FunctionGlobalPatch {
 	idx GlobalIndex
+mut:
 	pos int
 }
 
+type FunctionPatch = CallPatch | FunctionGlobalPatch
+
+struct FunctionLocal {
+	typ  ValType
+	name ?string
+}
+
 pub struct Function {
 	tidx int
 	idx  int
 mut:
-	call_patches   []CallPatch
-	global_patches []FunctionGlobalPatch
-	label          int
-	export         bool
-	mod            &Module = unsafe { nil }
-	code           []u8
-	locals         []ValType
+	patches []FunctionPatch // sorted
+	label   int
+	export  bool
+	mod     &Module = unsafe { nil }
+	code    []u8
+	locals  []FunctionLocal
 pub:
 	name string
 }