Revert "Insert checks before deferred calls and accesses."

sdk/lib/_internal/compiler/implementation/ssa/builder.dart

Index: sdk/lib/_internal/compiler/implementation/ssa/builder.dart
diff --git a/sdk/lib/_internal/compiler/implementation/ssa/builder.dart b/sdk/lib/_internal/compiler/implementation/ssa/builder.dart
index 91b0977e722bdb92b70739138ee4b321fb4c70bb..0e43ef7ecdcd2097232ccbac5545d3c703e8d34e 100644
--- a/sdk/lib/_internal/compiler/implementation/ssa/builder.dart
+++ b/sdk/lib/_internal/compiler/implementation/ssa/builder.dart
@@ -1172,8 +1172,9 @@ class SsaBuilder extends ResolvedVisitor {
     bool meetsHardConstraints() {
       // Don't inline from one output unit to another. If something is deferred
       // it is to save space in the loading code.
-      if (!compiler.deferredLoadTask
-          .inSameOutputUnit(element,compiler.currentElement)) {
+      var getOutputUnit = compiler.deferredLoadTask.outputUnitForElement;
+      if (getOutputUnit(element) !=
+          getOutputUnit(compiler.currentElement)) {
         return false;
       }
       if (compiler.disableInlining) return false;
@@ -2928,24 +2929,6 @@ class SsaBuilder extends ResolvedVisitor {
     pushInvokeDynamic(send, selector, [receiver]);
   }
 
-  /// Inserts a call to checkDeferredIsLoaded if the send has a prefix that
-  /// resolves to a deferred library.
-  void generateIsDeferredLoadedCheckIfNeeded(ast.Send node) {
-    DeferredLoadTask deferredTask = compiler.deferredLoadTask;
-    PrefixElement prefixElement =
-         deferredTask.deferredPrefixElement(node, elements);
-    if (prefixElement != null) {
-      String loadId =
-          deferredTask.importDeferName[prefixElement.deferredImport];
-      HInstruction loadIdConstant = addConstantString(loadId);
-      String uri = prefixElement.deferredImport.uri.dartString.slowToString();
-      HInstruction uriConstant = addConstantString(uri);
-      Element helper = backend.getCheckDeferredIsLoaded();
-      pushInvokeStatic(node, helper, [loadIdConstant, uriConstant]);
-      pop();
-    }
-  }
-
   void generateGetter(ast.Send send, Element element) {
     if (element != null && element.isForeign(compiler)) {
       visitForeignGetter(send);
@@ -3938,8 +3921,6 @@ class SsaBuilder extends ResolvedVisitor {
 
   handleNewSend(ast.NewExpression node) {
     ast.Send send = node.send;
-    generateIsDeferredLoadedCheckIfNeeded(send);
-
     bool isFixedList = false;
     bool isFixedListConstructorCall =
         Elements.isFixedListConstructorCall(elements[send], send, compiler);
@@ -4191,7 +4172,6 @@ class SsaBuilder extends ResolvedVisitor {
       return;
     }
     invariant(element, !element.isGenerativeConstructor());
-    generateIsDeferredLoadedCheckIfNeeded(node);
     if (element.isFunction()) {
       var inputs = <HInstruction>[];
       // TODO(5347): Try to avoid the need for calling [implementation] before
@@ -4267,7 +4247,6 @@ class SsaBuilder extends ResolvedVisitor {
   }
 
   visitGetterSend(ast.Send node) {
-    generateIsDeferredLoadedCheckIfNeeded(node);
     generateGetter(node, elements[node]);
   }
 
@@ -4536,7 +4515,6 @@ class SsaBuilder extends ResolvedVisitor {
   }
 
   visitSendSet(ast.SendSet node) {
-    generateIsDeferredLoadedCheckIfNeeded(node);
     Element element = elements[node];
     if (!Elements.isUnresolved(element) && element.impliesType()) {
       ast.Identifier selector = node.selector;