[turbofan] Initialize less frequently used types in typer.cc lazily.

src/compiler/typer.h

Index: src/compiler/typer.h
diff --git a/src/compiler/typer.h b/src/compiler/typer.h
index 2cd95970fcf9b3cde4f7ceafad702c6522ab701d..6c5bc1e2814fef6302833a1ab3fddce8323d4a18 100644
--- a/src/compiler/typer.h
+++ b/src/compiler/typer.h
@@ -15,6 +15,8 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
+struct LazyTypeCache;
+
 class Typer {
  public:
   explicit Typer(Graph* graph, MaybeHandle<Context> context);
@@ -60,18 +62,8 @@ class Typer {
   Type* number_fun1_;
   Type* number_fun2_;
   Type* weakint_fun1_;
-  Type* imul_fun_;
-  Type* clz32_fun_;
   Type* random_fun_;
-  Type* array_buffer_fun_;
-  Type* int8_array_fun_;
-  Type* int16_array_fun_;
-  Type* int32_array_fun_;
-  Type* uint8_array_fun_;
-  Type* uint16_array_fun_;
-  Type* uint32_array_fun_;
-  Type* float32_array_fun_;
-  Type* float64_array_fun_;
+  LazyTypeCache* cache_;
 
   ZoneVector<Handle<Object> > weaken_min_limits_;
   ZoneVector<Handle<Object> > weaken_max_limits_;