SIL: add var FullApplySite.singleDirectErrorResult

Author: eeckstein

SwiftCompilerSources/Sources/SIL/ApplySite.swift

@@ -296,6 +296,7 @@ extension ApplySite {
 
 public protocol FullApplySite : ApplySite {
   var singleDirectResult: Value? { get }
+  var singleDirectErrorResult: Value? { get }
 }
 
 extension FullApplySite {

SwiftCompilerSources/Sources/SIL/Instruction.swift

@@ -1205,6 +1205,7 @@ final public class ApplyInst : SingleValueInstruction, FullApplySite {
   public var numArguments: Int { bridged.ApplyInst_numArguments() }
 
   public var singleDirectResult: Value? { self }
+  public var singleDirectErrorResult: Value? { nil }
 
   public var isNonThrowing: Bool { bridged.ApplyInst_getNonThrowing() }
   public var isNonAsync: Bool { bridged.ApplyInst_getNonAsync() }
@@ -1478,6 +1479,7 @@ final public class BeginApplyInst : MultipleValueInstruction, FullApplySite {
   public var numArguments: Int { bridged.BeginApplyInst_numArguments() }
 
   public var singleDirectResult: Value? { nil }
+  public var singleDirectErrorResult: Value? { nil }
 
   public var token: Value { getResult(index: resultCount - 1) }
 
@@ -1637,6 +1639,7 @@ final public class TryApplyInst : TermInst, FullApplySite {
   public var errorBlock: BasicBlock { successors[1] }
 
   public var singleDirectResult: Value? { normalBlock.arguments[0] }
+  public var singleDirectErrorResult: Value? { errorBlock.arguments[0] }
 
   public var isNonAsync: Bool { bridged.TryApplyInst_getNonAsync() }
   public var specializationInfo: ApplyInst.SpecializationInfo { bridged.TryApplyInst_getSpecializationInfo() }