[turbofan] Fix truncation query names.

Change-Id: I8a1e53d1836f4c68f571d397c35dd6f091e68076
Reviewed-on: https://chromium-review.googlesource.com/577537Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46829}

src/compiler/representation-change.h

@@ -53,11 +53,11 @@ class Truncation final {
   bool IsUsedAsFloat64() const {
     return LessGeneral(kind_, TruncationKind::kFloat64);
   }
-  bool IdentifiesNaNAndZero() {
+  bool IdentifiesUndefinedAndZero() {
     return LessGeneral(kind_, TruncationKind::kWord32) ||
            LessGeneral(kind_, TruncationKind::kBool);
   }
-  bool IdentifiesUndefinedAndNaNAndZero() {
+  bool IdentifiesUndefinedAndNaN() {
     return LessGeneral(kind_, TruncationKind::kFloat64) ||
            LessGeneral(kind_, TruncationKind::kWord64);
   }

src/compiler/simplified-lowering.cc

@@ -127,12 +127,12 @@ UseInfo TruncatingUseInfoFromRepresentation(MachineRepresentation rep) {
       return UseInfo::TruncatingFloat64();
     case MachineRepresentation::kFloat32:
       return UseInfo::Float32();
-    case MachineRepresentation::kWord64:
-      return UseInfo::TruncatingWord64();
     case MachineRepresentation::kWord8:
     case MachineRepresentation::kWord16:
     case MachineRepresentation::kWord32:
       return UseInfo::TruncatingWord32();
+    case MachineRepresentation::kWord64:
+      return UseInfo::TruncatingWord64();
     case MachineRepresentation::kBit:
       return UseInfo::Bool();
     case MachineRepresentation::kSimd128:
@@ -2517,8 +2517,8 @@ class RepresentationSelector {
         ProcessRemainingInputs(node, 3);
 
         MachineRepresentation output;
-        if (truncation.IdentifiesUndefinedAndNaNAndZero()) {
-          if (truncation.IdentifiesNaNAndZero()) {
+        if (truncation.IdentifiesUndefinedAndNaN()) {
+          if (truncation.IdentifiesUndefinedAndZero()) {
             // If undefined is truncated to a non-NaN number, we can use
             // the load's representation.
             output = access.machine_type().representation();