Swift SIL: add Instruction.isDeleted API

Author: eeckstein

SwiftCompilerSources/Sources/SIL/Instruction.swift

@@ -42,6 +42,10 @@ public class Instruction : ListNode, CustomStringConvertible, Hashable {
     return String(_cxxString: stdString)
   }
 
+  final public var isDeleted: Bool {
+    return SILInstruction_isDeleted(bridged)
+  }
+
   final public var operands: OperandArray {
     return OperandArray(opArray: SILInstruction_getOperands(bridged))
   }

include/swift/SIL/SILBridging.h

@@ -341,6 +341,7 @@ BridgedArgumentConvention SILArgument_getConvention(BridgedArgument argument);
 OptionalBridgedInstruction SILInstruction_next(BridgedInstruction inst);
 OptionalBridgedInstruction SILInstruction_previous(BridgedInstruction inst);
 BridgedBasicBlock SILInstruction_getParent(BridgedInstruction inst);
+bool SILInstruction_isDeleted(BridgedInstruction inst);
 BridgedArrayRef SILInstruction_getOperands(BridgedInstruction inst);
 void SILInstruction_setOperand(BridgedInstruction inst, SwiftInt index,
                                BridgedValue value);

lib/SIL/Utils/SILBridging.cpp

@@ -747,6 +747,10 @@ BridgedBasicBlock SILInstruction_getParent(BridgedInstruction inst) {
   return {i->getParent()};
 }
 
+bool SILInstruction_isDeleted(BridgedInstruction inst) {
+  return castToInst(inst)->isDeleted();
+}
+
 BridgedArrayRef SILInstruction_getOperands(BridgedInstruction inst) {
   auto operands = castToInst(inst)->getAllOperands();
   return {(const unsigned char *)operands.data(), operands.size()};