[turbofan] Make TyperCache global and thread safe.

src/compiler/typer.h

Index: src/compiler/typer.h
diff --git a/src/compiler/typer.h b/src/compiler/typer.h
index 1d5929822aaf113311bf4f6927d713801a4b15f6..5c59b5610bf8ab2bcb795873942067a2c6a659ed 100644
--- a/src/compiler/typer.h
+++ b/src/compiler/typer.h
@@ -13,7 +13,7 @@ namespace internal {
 namespace compiler {
 
 // Forward declarations.
-class LazyTypeCache;
+class TyperCache;
 
 
 class Typer {
@@ -41,18 +41,14 @@ class Typer {
   Type::FunctionType* function_type_;
   MaybeHandle<Context> const context_;
   Decorator* decorator_;
+  TyperCache const& cache_;
 
   Type* singleton_false_;
   Type* singleton_true_;
-  Type* singleton_zero_;
-  Type* singleton_one_;
-  Type* zero_or_one_;
-  Type* zeroish_;
   Type* signed32ish_;
   Type* unsigned32ish_;
   Type* falsish_;
   Type* truish_;
-  LazyTypeCache* const cache_;
 
   DISALLOW_COPY_AND_ASSIGN(Typer);
 };