[turbofan] Osr value typing + dynamic type checks on entry.

src/compiler/common-operator.h

Index: src/compiler/common-operator.h
diff --git a/src/compiler/common-operator.h b/src/compiler/common-operator.h
index 2db0bfa7d19f0d15636f40deb7d17be995ebe528..4ea7b67909da9ecb7b3c673b07f36caaa39e1bdb 100644
--- a/src/compiler/common-operator.h
+++ b/src/compiler/common-operator.h
@@ -171,6 +171,13 @@ std::ostream& operator<<(std::ostream& os,
 
 Type* TypeGuardTypeOf(Operator const*) WARN_UNUSED_RESULT;
 
+int OsrValueIndexOf(Operator const*);
+
+enum class OsrGuardType { kUninitialized, kSignedSmall, kAny };
+size_t hash_value(OsrGuardType type);
+std::ostream& operator<<(std::ostream&, OsrGuardType);
+OsrGuardType OsrGuardTypeOf(Operator const*);
+
 // Interface for building common operators that can be used at any level of IR,
 // including JavaScript, mid-level, and low-level.
 class CommonOperatorBuilder final : public ZoneObject {
@@ -202,6 +209,7 @@ class CommonOperatorBuilder final : public ZoneObject {
   const Operator* OsrNormalEntry();
   const Operator* OsrLoopEntry();
   const Operator* OsrValue(int index);
+  const Operator* OsrGuard(OsrGuardType type);
 
   const Operator* Int32Constant(int32_t);
   const Operator* Int64Constant(int64_t);