Revert "Avoid "=== true" inside code by calling a function that does this for us."

lib/compiler/implementation/ssa/nodes.dart

Index: lib/compiler/implementation/ssa/nodes.dart
diff --git a/lib/compiler/implementation/ssa/nodes.dart b/lib/compiler/implementation/ssa/nodes.dart
index 9d869462709263875c5479bea49089b6cd106adb..f9fb69ef9bf4193fdf7527952956942a02297a04 100644
--- a/lib/compiler/implementation/ssa/nodes.dart
+++ b/lib/compiler/implementation/ssa/nodes.dart
@@ -590,22 +590,6 @@ class HBasicBlock extends HInstructionList implements Hashable {
     }
   }
 
-  static void removeUser(HInstruction instruction, HInstruction user) {
-    List<HInstruction> users = instruction.usedBy;
-    int length = users.length;
-    if (length == 1) {
-      users.clear();
-    } else {
-      for (int i = 0; i < length; i++) {
-        if (users[i] === user) {
-          users[i] = users[length - 1];
-          users.length = length - 1;
-          return;
-        }
-      }
-    }
-  }
-
   bool isExitBlock() {
     return first === last && first is HExit;
   }
@@ -1840,7 +1824,6 @@ class HPhi extends HInstruction {
 }
 
 class HRelational extends HInvokeBinary {
-  bool usesBoolifiedInterceptor = false;
   HRelational(HStatic target, HInstruction left, HInstruction right)
       : super(target, left, right);
 
@@ -1857,12 +1840,7 @@ class HRelational extends HInvokeBinary {
   }
 
   HType computeTypeFromInputTypes() {
-    if (left.isNumber() || usesBoolifiedInterceptor) return HType.BOOLEAN;
-    return HType.UNKNOWN;
-  }
-
-  HType get guaranteedType() {
-    if (usesBoolifiedInterceptor) return HType.BOOLEAN;
+    if (left.isNumber()) return HType.BOOLEAN;
     return HType.UNKNOWN;
   }
 
@@ -1898,7 +1876,7 @@ class HEquals extends HRelational {
   }
 
   HType computeTypeFromInputTypes() {
-    if (builtin || usesBoolifiedInterceptor) return HType.BOOLEAN;
+    if (builtin) return HType.BOOLEAN;
     return HType.UNKNOWN;
   }