Use Entity instead of Element in ConstantValue

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

Index: pkg/compiler/lib/src/ssa/builder_kernel.dart
diff --git a/pkg/compiler/lib/src/ssa/builder_kernel.dart b/pkg/compiler/lib/src/ssa/builder_kernel.dart
index 39e65e0fae69399ed4c599905c201986ba65c0c1..bc845b6ced0ff21a2ed62b7b0097e4b46346d34f 100644
--- a/pkg/compiler/lib/src/ssa/builder_kernel.dart
+++ b/pkg/compiler/lib/src/ssa/builder_kernel.dart
@@ -1199,8 +1199,8 @@ class KernelSsaBuilder extends ir.Visitor with GraphBuilder {
     // If runtime type information is needed and the map literal has no type
     // parameters, 'constructor' is a static function that forwards the call to
     // the factory constructor without type parameters.
-    assert(constructor.kind == ir.ProcedureKind.Method
-        || constructor.kind == ir.ProcedureKind.Factory);
+    assert(constructor.kind == ir.ProcedureKind.Method ||
+        constructor.kind == ir.ProcedureKind.Factory);
 
     // The instruction type will always be a subtype of the mapLiteralClass, but
     // type inference might discover a more specific type, or find nothing (in