[turbofan] Introduce prediction for exception handlers.

src/compiler/x64/instruction-selector-x64.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <algorithm>
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
@@ skipping 1029 matching lines @@
     InstructionOperand value =
         g.CanBeImmediate(node)
             ? g.UseImmediate(node)
             : IsSupported(ATOM) ? g.UseRegister(node) : g.Use(node);
     Emit(kX64Push, g.NoOutput(), value);
   }
 
   // Pass label of exception handler block.
   CallDescriptor::Flags flags = descriptor->flags();
   if (handler) {
+    DCHECK_EQ(IrOpcode::kIfException, handler->front()->opcode());
+    IfExceptionHint hint = OpParameter<IfExceptionHint>(handler->front());
+    if (hint == IfExceptionHint::kLocallyCaught) {
+      flags |= CallDescriptor::kHasLocalCatchHandler;
+    }
     flags |= CallDescriptor::kHasExceptionHandler;
     buffer.instruction_args.push_back(g.Label(handler));
   }
 
   // Select the appropriate opcode based on the call type.
   InstructionCode opcode;
   switch (descriptor->kind()) {
     case CallDescriptor::kCallCodeObject:
       opcode = kArchCallCodeObject;
       break;
@@ skipping 567 matching lines @@
   if (CpuFeatures::IsSupported(SSE4_1)) {
     flags |= MachineOperatorBuilder::kFloat64RoundDown |
              MachineOperatorBuilder::kFloat64RoundTruncate;
   }
   return flags;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8