[turbofan] Introduce prediction for exception handlers.

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 cc23bf1c8fb040ab449c9022924b4b12264ca09c..0ddcc44bc660d5bb848d80d679d8ddfbd1fa03fe 100644
--- a/src/compiler/common-operator.h
+++ b/src/compiler/common-operator.h
@@ -34,6 +34,14 @@ std::ostream& operator<<(std::ostream&, BranchHint);
 BranchHint BranchHintOf(const Operator* const);
 
 
+// Prediction whether throw-site is surrounded by any local catch-scope.
+enum class IfExceptionHint { kLocallyUncaught, kLocallyCaught };
+
+size_t hash_value(IfExceptionHint hint);
+
+std::ostream& operator<<(std::ostream&, IfExceptionHint);
+
+
 class SelectParameters final {
  public:
   explicit SelectParameters(MachineType type,
@@ -94,7 +102,7 @@ class CommonOperatorBuilder final : public ZoneObject {
   const Operator* IfTrue();
   const Operator* IfFalse();
   const Operator* IfSuccess();
-  const Operator* IfException();
+  const Operator* IfException(IfExceptionHint hint);
   const Operator* Switch(size_t control_output_count);
   const Operator* IfValue(int32_t value);
   const Operator* IfDefault();