Swift SIL: add ApplySite.numIndirectResultArguments

Author: eeckstein

SwiftCompilerSources/Sources/SIL/ApplySite.swift

@@ -133,4 +133,11 @@ extension FullApplySite {
     }
     return nil
   }
+
+  /// The number of indirect out arguments.
+  ///
+  /// 0 if the callee has a direct or no return value and 1, if it has an indirect return value.
+  public var numIndirectResultArguments: Int {
+    return FullApplySite_numIndirectResultArguments(bridged)
+  }
 }

include/swift/SIL/SILBridging.h

@@ -428,6 +428,7 @@ swift::SubstitutionMap ApplySite_getSubstitutionMap(BridgedInstruction inst);
 BridgedArgumentConvention
 ApplySite_getArgumentConvention(BridgedInstruction inst, SwiftInt calleeArgIdx);
 SwiftInt ApplySite_getNumArguments(BridgedInstruction inst);
+SwiftInt FullApplySite_numIndirectResultArguments(BridgedInstruction inst);
 
 BridgedInstruction SILBuilder_createBuiltinBinaryFunction(
           BridgedBuilder builder, llvm::StringRef name,

lib/SIL/Utils/SILBridging.cpp

@@ -1020,6 +1020,12 @@ SwiftInt ApplySite_getNumArguments(BridgedInstruction inst) {
   return as.getNumArguments();
 }
 
+SwiftInt FullApplySite_numIndirectResultArguments(BridgedInstruction inst) {
+  auto fas = FullApplySite(castToInst(inst));
+  return fas.getNumIndirectSILResults();
+
+}
+
 //===----------------------------------------------------------------------===//
 //                                SILBuilder
 //===----------------------------------------------------------------------===//