Revert "Avoid getInterceptor calls in cases were the interceptor would be constant if it were not `…

pkg/compiler/lib/src/ssa/nodes.dart

Index: pkg/compiler/lib/src/ssa/nodes.dart
diff --git a/pkg/compiler/lib/src/ssa/nodes.dart b/pkg/compiler/lib/src/ssa/nodes.dart
index d610ebe65b273974429f2fe8939eb122a01896da..9759c5c209ddcf5128552d50b1c610aefaf949d7 100644
--- a/pkg/compiler/lib/src/ssa/nodes.dart
+++ b/pkg/compiler/lib/src/ssa/nodes.dart
@@ -2300,34 +2300,15 @@ class HInterceptor extends HInstruction {
   // This field should originally be null to allow GVN'ing all
   // [HInterceptor] on the same input.
   Set<ClassElement> interceptedClasses;
-
-  // inputs[0] is initially the only input, the receiver.
-
-  // inputs[1] is a constant interceptor when the interceptor is a constant
-  // except for a `null` receiver.  This is used when the receiver can't be
-  // falsy, except for `null`, allowing the generation of code like
-  //
-  //     (a && C.JSArray_methods).get$first(a)
-  //
-
   HInterceptor(HInstruction receiver, TypeMask type)
       : super(<HInstruction>[receiver], type) {
     sideEffects.clearAllSideEffects();
     sideEffects.clearAllDependencies();
     setUseGvn();
   }
-
   String toString() => 'interceptor on $interceptedClasses';
   accept(HVisitor visitor) => visitor.visitInterceptor(this);
   HInstruction get receiver => inputs[0];
-
-  bool get isConditionalConstantInterceptor => inputs.length == 2;
-  HInstruction get conditionalConstantInterceptor => inputs[1];
-  void set conditionalConstantInterceptor(HConstant constant) {
-    assert(!isNullOrConstantInterceptor);
-    inputs.add(constant);
-  }
-
   bool isInterceptor(Compiler compiler) => true;
 
   int typeCode() => HInstruction.INTERCEPTOR_TYPECODE;