Revert "Remove NSM if followed by a foreign with same effect."

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

Index: pkg/compiler/lib/src/ssa/optimize.dart
diff --git a/pkg/compiler/lib/src/ssa/optimize.dart b/pkg/compiler/lib/src/ssa/optimize.dart
index d92a99f79e8566153ab4783b4038640bc0863a2f..5c6ec19ebf89fde870b1a0d6d10ffff330d6dfd3 100644
--- a/pkg/compiler/lib/src/ssa/optimize.dart
+++ b/pkg/compiler/lib/src/ssa/optimize.dart
@@ -1001,33 +1001,6 @@ class SsaDeadCodeEliminator extends HGraphVisitor implements OptimizationPhase {
     return zapInstructionCache;
   }
 
-  /// Returns true of [foreign] will throw an noSuchMethod error if
-  /// receiver is `null` before having any other side-effects.
-  bool templateThrowsNSMonNull(HForeignCode foreign, HInstruction receiver) {
-    // We look for a template of the form
-    //
-    // #.something -or- #.something()
-    //
-    // where # is substituted by receiver.
-    js.Template template = foreign.codeTemplate;
-    js.Node node = template.ast;
-    // #.something = ...
-    if (node is js.Assignment) {
-      js.Assignment assignment = node;
-      node = assignment.leftHandSide;
-    }
-
-    // #.something
-    if (node is js.PropertyAccess) {
-      js.PropertyAccess access = node;
-      if (access.receiver is js.InterpolatedExpression) {
-        js.InterpolatedExpression hole = access.receiver;
-        return hole.isPositional && foreign.inputs.first == receiver;
-      }
-    }
-    return false;
-  }
-
   /// Returns whether the next throwing instruction that may have side
   /// effects after [instruction], throws [NoSuchMethodError] on the
   /// same receiver of [instruction].
@@ -1039,9 +1012,6 @@ class SsaDeadCodeEliminator extends HGraphVisitor implements OptimizationPhase {
           && current.canThrow()) {
         return true;
       }
-      if (current is HForeignCode && templateThrowsNSM(current, receiver)) {
-        return true;
-      }
       if (current.canThrow() || current.sideEffects.hasSideEffects()) {
         return false;
       }