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

src/compiler/common-operator.cc

Index: src/compiler/common-operator.cc
diff --git a/src/compiler/common-operator.cc b/src/compiler/common-operator.cc
index e57160a3f8553411ee0722e1c9a7e3b6255de15a..8ed4bae950b46da040773044055b79ba84dae162 100644
--- a/src/compiler/common-operator.cc
+++ b/src/compiler/common-operator.cc
@@ -210,6 +210,31 @@ std::ostream& operator<<(std::ostream& os,
   return os;
 }
 
+int OsrValueIndexOf(Operator const* op) {
+  DCHECK_EQ(IrOpcode::kOsrValue, op->opcode());
+  return OpParameter<int>(op);
+}
+
+size_t hash_value(OsrGuardType type) { return static_cast<size_t>(type); }
+
+std::ostream& operator<<(std::ostream& os, OsrGuardType type) {
+  switch (type) {
+    case OsrGuardType::kUninitialized:
+      return os << "Uninitialized";
+    case OsrGuardType::kSignedSmall:
+      return os << "SignedSmall";
+    case OsrGuardType::kAny:
+      return os << "Any";
+  }
+  UNREACHABLE();
+  return os;
+}
+
+OsrGuardType OsrGuardTypeOf(Operator const* op) {
+  DCHECK_EQ(IrOpcode::kOsrGuard, op->opcode());
+  return OpParameter<OsrGuardType>(op);
+}
+
 #define CACHED_OP_LIST(V)                                                     \
   V(Dead, Operator::kFoldable, 0, 0, 0, 1, 1, 1)                              \
   V(IfTrue, Operator::kKontrol, 0, 0, 1, 0, 0, 1)                             \
@@ -780,7 +805,6 @@ const Operator* CommonOperatorBuilder::Parameter(int index,
       ParameterInfo(index, debug_name));         // parameter info
 }
 
-
 const Operator* CommonOperatorBuilder::OsrValue(int index) {
   return new (zone()) Operator1<int>(                // --
       IrOpcode::kOsrValue, Operator::kNoProperties,  // opcode
@@ -789,6 +813,13 @@ const Operator* CommonOperatorBuilder::OsrValue(int index) {
       index);                                        // parameter
 }
 
+const Operator* CommonOperatorBuilder::OsrGuard(OsrGuardType type) {
+  return new (zone()) Operator1<OsrGuardType>(  // --
+      IrOpcode::kOsrGuard, Operator::kNoThrow,  // opcode
+      "OsrGuard",                               // name
+      1, 1, 1, 1, 1, 0,                         // counts
+      type);                                    // parameter
+}
 
 const Operator* CommonOperatorBuilder::Int32Constant(int32_t value) {
   return new (zone()) Operator1<int32_t>(         // --