cmd/compile: remove InterMethod type - not used anywhere

Change-Id: I2c402d9491b373316775b515ce389555e58acb1a
Reviewed-on: https://go-review.googlesource.com/39636
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

src/cmd/compile/internal/gc/sizeof_test.go

@@ -35,7 +35,6 @@ func TestSizeof(t *testing.T) {
 		{InterType{}, 4, 8},
 		{ChanType{}, 8, 16},
 		{ArrayType{}, 12, 16},
-		{InterMethType{}, 4, 8},
 		{DDDFieldType{}, 4, 8},
 		{FuncArgsType{}, 4, 8},
 		{ChanArgsType{}, 4, 8},

src/cmd/compile/internal/gc/type.go

@@ -126,7 +126,6 @@ type Type struct {
 	// TMAP: *MapType
 	// TFORW: *ForwardType
 	// TFUNC: *FuncType
-	// TINTERMETHOD: InterMethType
 	// TSTRUCT: *StructType
 	// TINTER: *InterType
 	// TDDDFIELD: DDDFieldType
@@ -232,11 +231,6 @@ func (t *Type) FuncType() *FuncType {
 	return t.Extra.(*FuncType)
 }
 
-// InterMethType contains Type fields specific to interface method pseudo-types.
-type InterMethType struct {
-	Nname *Node
-}
-
 // StructType contains Type fields specific to struct types.
 type StructType struct {
 	fields Fields