go.tools/go/types: cleanup: more consistent exported predicate names

Renamed predicates:
IsIdentical -> Identical
IsAssignableTo -> AssignableTo
Signature.IsVariadic -> Signature.Variadic
Object.IsExported -> Object.Exported

LGTM=adonovan
R=adonovan
CC=golang-codereviews
https://golang.org/cl/53370043

2 files changed, 8 insertions, 8 deletions

diff --git a/oracle/implements.go b/oracle/implements.go
index b5a577a..d914227 100644
--- a/oracle/implements.go
+++ b/oracle/implements.go
@@ -60,19 +60,19 @@ func implements(o *Oracle, qpos *QueryPos) (queryResult, error) {
 				}
 
 				// T interface, U interface
-				if !types.IsIdentical(T, U) {
-					if types.IsAssignableTo(U, T) {
+				if !types.Identical(T, U) {
+					if types.AssignableTo(U, T) {
 						to = append(to, U)
 					}
-					if types.IsAssignableTo(T, U) {
+					if types.AssignableTo(T, U) {
 						from = append(from, U)
 					}
 				}
 			} else {
 				// T interface, U concrete
-				if types.IsAssignableTo(U, T) {
+				if types.AssignableTo(U, T) {
 					to = append(to, U)
-				} else if pU := types.NewPointer(U); types.IsAssignableTo(pU, T) {
+				} else if pU := types.NewPointer(U); types.AssignableTo(pU, T) {
 					to = append(to, pU)
 				}
 			}
@@ -82,9 +82,9 @@ func implements(o *Oracle, qpos *QueryPos) (queryResult, error) {
 			}
 
 			// T concrete, U interface
-			if types.IsAssignableTo(T, U) {
+			if types.AssignableTo(T, U) {
 				from = append(from, U)
-			} else if pT := types.NewPointer(T); types.IsAssignableTo(pT, U) {
+			} else if pT := types.NewPointer(T); types.AssignableTo(pT, U) {
 				fromPtr = append(fromPtr, U)
 			}
 		}
diff --git a/oracle/peers.go b/oracle/peers.go
index fa34c9e..c7c24b9 100644
--- a/oracle/peers.go
+++ b/oracle/peers.go
@@ -63,7 +63,7 @@ func peers(o *Oracle, qpos *QueryPos) (queryResult, error) {
 	o.ptaConfig.AddQuery(queryOp.ch)
 	i := 0
 	for _, op := range ops {
-		if types.IsIdentical(op.ch.Type().Underlying().(*types.Chan).Elem(), queryElemType) {
+		if types.Identical(op.ch.Type().Underlying().(*types.Chan).Elem(), queryElemType) {
 			o.ptaConfig.AddQuery(op.ch)
 			ops[i] = op
 			i++