[clang][NFC] Pass the ASTContext to CXXRecordDecl::setCaptures

In general Decl::getASTContext() is relatively expensive and here the changes
are non-invasive. NFC.

clang/include/clang/AST/DeclCXX.h

@@ -1025,7 +1025,7 @@ public:
   }
 
   /// Set the captures for this lambda closure type.
-  void setCaptures(ArrayRef<LambdaCapture> Captures);
+  void setCaptures(ASTContext &Context, ArrayRef<LambdaCapture> Captures);
 
   /// For a closure type, retrieve the mapping from captured
   /// variables and \c this to the non-static data members that store the

clang/lib/AST/ASTImporter.cpp

@@ -1900,7 +1900,8 @@ Error ASTNodeImporter::ImportDefinition(
           else
             return ToCaptureOrErr.takeError();
         }
-        cast<CXXRecordDecl>(To)->setCaptures(ToCaptures);
+        cast<CXXRecordDecl>(To)->setCaptures(Importer.getToContext(),
+                                             ToCaptures);
       }
 
       Error Result = ImportDeclContext(From, /*ForceImport=*/true);

clang/lib/AST/DeclCXX.cpp

@@ -1383,8 +1383,8 @@ void CXXRecordDecl::finishedDefaultedOrDeletedMember(CXXMethodDecl *D) {
     data().DeclaredNonTrivialSpecialMembers |= SMKind;
 }
 
-void CXXRecordDecl::setCaptures(ArrayRef<LambdaCapture> Captures) {
-  ASTContext &Context = getASTContext();
+void CXXRecordDecl::setCaptures(ASTContext &Context,
+                                ArrayRef<LambdaCapture> Captures) {
   CXXRecordDecl::LambdaDefinitionData &Data = getLambdaData();
 
   // Copy captures.

clang/lib/Sema/SemaLambda.cpp

@@ -1624,8 +1624,9 @@ FieldDecl *Sema::BuildCaptureField(RecordDecl *RD,
 
   // Build the non-static data member.
   FieldDecl *Field =
-      FieldDecl::Create(Context, RD, Loc, Loc, nullptr, FieldType, TSI, nullptr,
-                        false, ICIS_NoInit);
+      FieldDecl::Create(Context, RD, /*StartLoc=*/Loc, /*IdLoc=*/Loc,
+                        /*Id=*/nullptr, FieldType, TSI, /*BW=*/nullptr,
+                        /*Mutable=*/false, ICIS_NoInit);
   // If the variable being captured has an invalid type, mark the class as
   // invalid as well.
   if (!FieldType->isDependentType()) {
@@ -1785,7 +1786,7 @@ ExprResult Sema::BuildLambdaExpr(SourceLocation StartLoc, SourceLocation EndLoc,
         CUDACheckLambdaCapture(CallOperator, From);
     }
 
-    Class->setCaptures(Captures);
+    Class->setCaptures(Context, Captures);
 
     // C++11 [expr.prim.lambda]p6:
     //   The closure type for a lambda-expression with no lambda-capture