build: fix unsafe.Sizeof for llgo:type C

internal/packages/load.go

@@ -110,7 +110,9 @@ type Cached struct {
 }
 
 type aDeduper struct {
-	cache sync.Map
+	cache   sync.Map
+	setpath func(path string, name string) string
+	preload func(pkg *types.Package, syntax []*ast.File)
 }
 
 type Deduper = *aDeduper
@@ -119,6 +121,14 @@ func NewDeduper() Deduper {
 	return &aDeduper{}
 }
 
+func (p Deduper) SetPreload(fn func(pkg *types.Package, syntax []*ast.File)) {
+	p.preload = fn
+}
+
+func (p Deduper) SetPkgPath(fn func(path, name string) string) {
+	p.setpath = fn
+}
+
 func (p Deduper) Check(pkgPath string) *Cached {
 	if v, ok := p.cache.Load(pkgPath); ok {
 		return v.(*Cached)
@@ -186,6 +196,9 @@ func loadPackageEx(dedup Deduper, ld *loader, lpkg *loaderPackage) {
 				})
 			}
 		}()
+		if dedup.setpath != nil {
+			lpkg.PkgPath = dedup.setpath(lpkg.PkgPath, lpkg.Name)
+		}
 	}
 
 	// Call NewPackage directly with explicit name.
@@ -369,6 +382,10 @@ func loadPackageEx(dedup Deduper, ld *loader, lpkg *loaderPackage) {
 		panic("unreachable")
 	})
 
+	if dedup != nil && dedup.preload != nil {
+		dedup.preload(lpkg.Types, lpkg.Syntax)
+	}
+
 	// type-check
 	tc := &types.Config{
 		Importer: importer,