Add LifetimeDependence::get from param indices

Author: meg-gupta

include/swift/AST/LifetimeDependence.h

@@ -182,6 +182,10 @@ class LifetimeDependenceInfo {
 
   static llvm::Optional<LifetimeDependenceInfo>
   get(AbstractFunctionDecl *decl, Type resultType, bool allowIndex = false);
+
+  static LifetimeDependenceInfo
+  get(ASTContext &ctx, const SmallBitVector &inheritLifetimeIndices,
+      const SmallBitVector &scopeLifetimeIndices);
 };
 
 } // namespace swift

lib/Sema/LifetimeDependence.cpp

@@ -330,4 +330,16 @@ LifetimeDependenceInfo::get(AbstractFunctionDecl *afd, Type resultType,
   return LifetimeDependenceInfo::infer(afd, resultType);
 }
 
+LifetimeDependenceInfo
+LifetimeDependenceInfo::get(ASTContext &ctx,
+                            const SmallBitVector &inheritLifetimeIndices,
+                            const SmallBitVector &scopeLifetimeIndices) {
+  return LifetimeDependenceInfo{
+      inheritLifetimeIndices.any()
+          ? IndexSubset::get(ctx, inheritLifetimeIndices)
+          : nullptr,
+      scopeLifetimeIndices.any() ? IndexSubset::get(ctx, scopeLifetimeIndices)
+                                 : nullptr};
+}
+
 } // namespace swift