code review 4528123: godefs: rudimentary tests

src/cmd/godefs/testdata_darwin_amd64.golden

+// ./godefs -g test -f-m64 testdata.c
+
+// MACHINE GENERATED - DO NOT EDIT.
+
+package test
+
+// Constants
+
+// Types
+
+type T2 struct {
+        A uint8;
+        Pad_godefs_0 [3]byte;
+        B uint32;
+        C uint32;
+        D uint16;
+        Pad_godefs_1 [2]byte;
+}
+
+type T3 struct {
+        A uint8;
+        Pad_godefs_0 [3]byte;
+        Pad0 int32;
+}
+
+type T4 struct {
+}
+
+type T5 struct {
+        A *T4;
+}