Refactor construction of ModuleDecl::ImportFilters to use new initializer list constructor (#33250)

This commit makes code cleaner by using newly introduced
 initializer list construction

Author: srinikhil-07

lib/AST/Module.cpp

@@ -1459,9 +1459,10 @@ SourceFile::collectLinkLibraries(ModuleDecl::LinkLibraryCallback callback) const
   llvm::SmallDenseSet<ModuleDecl *, 32> visited;
   SmallVector<ModuleDecl::ImportedModule, 32> stack;
 
-  ModuleDecl::ImportFilter filter = ModuleDecl::ImportFilterKind::Public;
-  filter |= ModuleDecl::ImportFilterKind::Private;
-  filter |= ModuleDecl::ImportFilterKind::SPIAccessControl;
+  ModuleDecl::ImportFilter filter = {
+      ModuleDecl::ImportFilterKind::Public,
+      ModuleDecl::ImportFilterKind::Private,
+      ModuleDecl::ImportFilterKind::SPIAccessControl};
 
   auto *topLevel = getParentModule();
 

lib/Frontend/ModuleInterfaceSupport.cpp

@@ -100,10 +100,10 @@ static void printImports(raw_ostream &out,
                          ModuleDecl *M) {
   // FIXME: This is very similar to what's in Serializer::writeInputBlock, but
   // it's not obvious what higher-level optimization would be factored out here.
-  ModuleDecl::ImportFilter allImportFilter;
-  allImportFilter |= ModuleDecl::ImportFilterKind::Public;
-  allImportFilter |= ModuleDecl::ImportFilterKind::Private;
-  allImportFilter |= ModuleDecl::ImportFilterKind::SPIAccessControl;
+  ModuleDecl::ImportFilter allImportFilter = {
+      ModuleDecl::ImportFilterKind::Public,
+      ModuleDecl::ImportFilterKind::Private,
+      ModuleDecl::ImportFilterKind::SPIAccessControl};
 
   // With -experimental-spi-imports:
   // When printing the private swiftinterface file, print implementation-only