Update vendored dependencies

vendor/golang.org/x/tools/go/gcexportdata/gcexportdata.go

@@ -100,7 +100,7 @@ func Read(in io.Reader, fset *token.FileSet, imports map[string]*types.Package,
 // Write writes encoded type information for the specified package to out.
 // The FileSet provides file position information for named objects.
 func Write(out io.Writer, fset *token.FileSet, pkg *types.Package) error {
-	b, err := gcimporter.BExportData(fset, pkg)
+	b, err := gcimporter.IExportData(fset, pkg)
 	if err != nil {
 		return err
 	}