Bug fix - use type of input, not type of result, for throw-on-null check

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 ddeaf26d502e78740c561c9900149e84003683b8..64e12387c5807762a746cc6b90d910d7876e28bf 100644
--- a/pkg/compiler/lib/src/ssa/nodes.dart
+++ b/pkg/compiler/lib/src/ssa/nodes.dart
@@ -1913,8 +1913,14 @@ class HForeignCode extends HForeign {
   accept(HVisitor visitor) => visitor.visitForeignCode(this);
 
   bool isJsStatement() => isStatement;
-  bool canThrow() =>
-      canBeNull() ? throwBehavior.canThrow : throwBehavior.onNonNull.canThrow;
+  bool canThrow() {
+    if (inputs.length > 0) {
+      return inputs.first.canBeNull()
+          ? throwBehavior.canThrow
+          : throwBehavior.onNonNull.canThrow;
+    }
+    return throwBehavior.canThrow;
+  }
 
   bool onlyThrowsNSM() => throwBehavior.isOnlyNullNSMGuard;