[turbofan] Project exception value out of calls.

src/compiler/instruction-selector.cc

Index: src/compiler/instruction-selector.cc
diff --git a/src/compiler/instruction-selector.cc b/src/compiler/instruction-selector.cc
index c1d66ea345aec415ebe343757f62445a2da4fefb..89c2fe1e459f1110b61fbaa0e25bbc2dc0b2d104 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -596,7 +596,6 @@ void InstructionSelector::VisitNode(Node* node) {
     case IrOpcode::kIfTrue:
     case IrOpcode::kIfFalse:
     case IrOpcode::kIfSuccess:
-    case IrOpcode::kIfException:
     case IrOpcode::kSwitch:
     case IrOpcode::kIfValue:
     case IrOpcode::kIfDefault:
@@ -604,6 +603,8 @@ void InstructionSelector::VisitNode(Node* node) {
     case IrOpcode::kMerge:
       // No code needed for these graph artifacts.
       return;
+    case IrOpcode::kIfException:
+      return MarkAsReference(node), VisitIfException(node);
     case IrOpcode::kFinish:
       return MarkAsReference(node), VisitFinish(node);
     case IrOpcode::kParameter: {
@@ -969,6 +970,16 @@ void InstructionSelector::VisitParameter(Node* node) {
 }
 
 
+void InstructionSelector::VisitIfException(Node* node) {
+  OperandGenerator g(this);
+  Node* call = node->InputAt(0);
+  DCHECK_EQ(IrOpcode::kCall, call->opcode());
+  const CallDescriptor* descriptor = OpParameter<const CallDescriptor*>(call);
+  Emit(kArchNop, g.DefineAsLocation(node, descriptor->GetReturnLocation(0),
+                                    descriptor->GetReturnType(0)));
+}
+
+
 void InstructionSelector::VisitOsrValue(Node* node) {
   OperandGenerator g(this);
   int index = OpParameter<int>(node);