SwiftCompilerSources: add the LoadBorrowInst.isUnchecked API

Author: eeckstein

SwiftCompilerSources/Sources/SIL/Instruction.swift

@@ -1256,7 +1256,15 @@ final public class BeginBorrowInst : SingleValueInstruction, UnaryInstruction, B
   }
 }
 
-final public class LoadBorrowInst : SingleValueInstruction, LoadInstruction, BorrowIntroducingInstruction {}
+final public class LoadBorrowInst : SingleValueInstruction, LoadInstruction, BorrowIntroducingInstruction {
+
+  // True if the invariants on `load_borrow` have not been checked and should not be strictly enforced.
+  //
+  // This can only occur during raw SIL before move-only checking occurs. Developers can write incorrect
+  // code using noncopyable types that consumes or mutates a memory location while that location is borrowed,
+  // but the move-only checker must diagnose those problems before canonical SIL is formed.
+  public var isUnchecked: Bool { bridged.LoadBorrowInst_isUnchecked() }
+}
 
 final public class StoreBorrowInst : SingleValueInstruction, StoringInstruction, BorrowIntroducingInstruction {
   var allocStack: AllocStackInst {

include/swift/SIL/SILBridging.h

@@ -788,6 +788,7 @@ struct BridgedInstruction {
 
   SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedStringRef CondFailInst_getMessage() const;
   BRIDGED_INLINE SwiftInt LoadInst_getLoadOwnership() const ;
+  BRIDGED_INLINE bool LoadBorrowInst_isUnchecked() const ;
   BRIDGED_INLINE BuiltinValueKind BuiltinInst_getID() const;
   BRIDGED_INLINE IntrinsicID BuiltinInst_getIntrinsicID() const;
   SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedSubstitutionMap BuiltinInst_getSubstitutionMap() const;

include/swift/SIL/SILBridgingImpl.h

@@ -1092,6 +1092,10 @@ SwiftInt BridgedInstruction::LoadInst_getLoadOwnership() const {
   return (SwiftInt)getAs<swift::LoadInst>()->getOwnershipQualifier();
 }
 
+bool BridgedInstruction::LoadBorrowInst_isUnchecked() const {
+  return (SwiftInt)getAs<swift::LoadBorrowInst>()->isUnchecked();
+}
+
 BridgedInstruction::BuiltinValueKind BridgedInstruction::BuiltinInst_getID() const {
   return (BuiltinValueKind)getAs<swift::BuiltinInst>()->getBuiltinInfo().ID;
 }