[turbofan] Sanitize the Truncation query method names.

src/compiler/representation-change.h

Index: src/compiler/representation-change.h
diff --git a/src/compiler/representation-change.h b/src/compiler/representation-change.h
index ab73a411db8a469e7a861fd1f29b286b4576fbb8..1500c498164dc606aa814a8b3560919b2bd73e63 100644
--- a/src/compiler/representation-change.h
+++ b/src/compiler/representation-change.h
@@ -29,17 +29,17 @@ class Truncation final {
 
   // Queries.
   bool IsUnused() const { return kind_ == TruncationKind::kNone; }
-  bool TruncatesToWord32() const {
+  bool IsUsedAsWord32() const {
     return LessGeneral(kind_, TruncationKind::kWord32);
   }
-  bool TruncatesToFloat64() const {
+  bool IsUsedAsFloat64() const {
     return LessGeneral(kind_, TruncationKind::kFloat64);
   }
-  bool TruncatesNaNToZero() {
+  bool IdentifiesNaNAndZero() {
     return LessGeneral(kind_, TruncationKind::kWord32) ||
            LessGeneral(kind_, TruncationKind::kBool);
   }
-  bool TruncatesUndefinedToZeroOrNaN() {
+  bool IdentifiesUndefinedAndNaNAndZero() {
     return LessGeneral(kind_, TruncationKind::kFloat64) ||
            LessGeneral(kind_, TruncationKind::kWord64);
   }