runtime: add zero field to rtype

The rtype struct is meant to be a copy of reflect.rtype.  The
zero field was added to reflect.rtype in 18495:6e50725ac753.

LGTM=rsc
R=khr, rsc
CC=golang-codereviews
https://golang.org/cl/93660045

diff --git a/src/pkg/runtime/type.go b/src/pkg/runtime/type.go
index 374754afaf410de8a6e21059f3a58a4fc0d24c47..276dbc0c9ccecdfb541ae95dc69d42505f5fc767 100644 (file)
--- a/src/pkg/runtime/type.go
+++ b/src/pkg/runtime/type.go
@@ -26,6 +26,7 @@ type rtype struct {
        string     *string
        *uncommonType
        ptrToThis *rtype
+       zero      unsafe.Pointer
 }
 
 type _method struct {