[turbofan] Remove the unused asm.js types from TypeCache.

src/compiler/typer.h

Index: src/compiler/typer.h
diff --git a/src/compiler/typer.h b/src/compiler/typer.h
index d4d5744a6eb5da4749f544a6bc11ba3b40c7a868..875b4839e5d6be0a8acbeeeb70381df1c25080cf 100644
--- a/src/compiler/typer.h
+++ b/src/compiler/typer.h
@@ -7,18 +7,13 @@
 
 #include "src/compiler/graph.h"
 #include "src/compiler/operation-typer.h"
-#include "src/types.h"
 
 namespace v8 {
 namespace internal {
-
-// Forward declarations.
-class TypeCache;
-
 namespace compiler {
 
+// Forward declarations.
 class LoopVariableOptimizer;
-class OperationTyper;
 
 class Typer {
  public: