[compiler] Add more tests for monotonicity of typing.

R=jarin@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2753543009
Cr-Commit-Position: refs/heads/master@{#43885}

src/compiler/operation-typer.h

@@ -23,7 +23,7 @@ class Operator;
 class Type;
 class TypeCache;
 
-class OperationTyper {
+class V8_EXPORT_PRIVATE OperationTyper {
  public:
   OperationTyper(Isolate* isolate, Zone* zone);