[interpreter] Faster and fewer flushes in register optimizer.

test/cctest/interpreter/bytecode_expectations/ClassAndSuperClass.golden

Index: test/cctest/interpreter/bytecode_expectations/ClassAndSuperClass.golden
diff --git a/test/cctest/interpreter/bytecode_expectations/ClassAndSuperClass.golden b/test/cctest/interpreter/bytecode_expectations/ClassAndSuperClass.golden
index 13e30ad84234ef0d33cfb7c4fbf82a7b288c611a..8efc41bbf45accb30ca892e218cb006333e7b114 100644
--- a/test/cctest/interpreter/bytecode_expectations/ClassAndSuperClass.golden
+++ b/test/cctest/interpreter/bytecode_expectations/ClassAndSuperClass.golden
@@ -29,8 +29,8 @@ bytecodes: [
                 B(Mov), R(closure), R(0),
   /*   99 E> */ B(StackCheck),
   /*  104 S> */ B(Nop),
-  /*  111 E> */ B(Ldar), R(closure),
-                B(Mov), R(this), R(3),
+  /*  111 E> */ B(Mov), R(this), R(3),
+                B(Ldar), R(closure),
                 B(JumpIfNotHole), U8(11),
                 B(LdaConstant), U8(0),
                 B(Star), R(6),
@@ -79,8 +79,8 @@ bytecodes: [
                 B(Mov), R(closure), R(0),
   /*  125 E> */ B(StackCheck),
   /*  130 S> */ B(Nop),
-  /*  130 E> */ B(Ldar), R(closure),
-                B(Mov), R(this), R(1),
+  /*  130 E> */ B(Mov), R(this), R(1),
+                B(Ldar), R(closure),
                 B(JumpIfNotHole), U8(11),
                 B(LdaConstant), U8(0),
                 B(Star), R(5),
@@ -94,8 +94,8 @@ bytecodes: [
   /*  138 E> */ B(Star), R(4),
                 B(CallRuntime), U16(Runtime::kStoreToSuper_Strict), R(1), U8(4),
   /*  143 S> */ B(Nop),
-  /*  150 E> */ B(Ldar), R(0),
-                B(Mov), R(this), R(1),
+  /*  150 E> */ B(Mov), R(this), R(1),
+                B(Ldar), R(0),
                 B(JumpIfNotHole), U8(11),
                 B(LdaConstant), U8(0),
                 B(Star), R(4),