build: supports LLGoFiles in patches

compiler/internal/build/build.go

@@ -359,6 +359,10 @@ func buildAllPkgs(ctx *context, initial []*packages.Package, verbose bool) (pkgs
 				panic(err)
 			}
 			aPkg.LinkArgs = append(cgoLdflags, pkg.ExportFile)
+			aPkg.LinkArgs = append(aPkg.LinkArgs, concatPkgLinkFiles(ctx, pkg, verbose)...)
+			if aPkg.AltPkg != nil {
+				aPkg.LinkArgs = append(aPkg.LinkArgs, concatPkgLinkFiles(ctx, aPkg.AltPkg.Package, verbose)...)
+			}
 			setNeedRuntimeOrPyInit(ctx, pkg, prog.NeedRuntime, prog.NeedPyInit)
 		}
 	}

compiler/internal/packages/load.go

@@ -106,6 +106,7 @@ type loader struct {
 }
 
 type Cached struct {
+	*packages.Package
 	Types     *types.Package
 	TypesInfo *types.Info
 	Syntax    []*ast.File
@@ -189,6 +190,7 @@ func loadPackageEx(dedup Deduper, ld *loader, lpkg *loaderPackage) {
 		defer func() {
 			if !lpkg.IllTyped && lpkg.needtypes && lpkg.needsrc {
 				dedup.set(lpkg.PkgPath, &Cached{
+					Package:   lpkg.Package,
 					Types:     lpkg.Types,
 					TypesInfo: lpkg.TypesInfo,
 					Syntax:    lpkg.Syntax,