fix(port): work around GCC false positive warning

GCC thinks that Memory_Resource::do_try_grow_in_place should be
declared 'final', but it is overwritten by Linked_Bump_Allocator.
Ignore GCC's false -Wsuggest-final-methods warning.

After fixing -Wsuggest-final-methods, GCC decides to report that the
entire Memory_Resource class can be marked final. Ignore this false
-Wsuggest-final-types warning as well.

src/quick-lint-js/port/memory-resource.h

@@ -8,9 +8,14 @@
 #include <new>
 #include <quick-lint-js/port/attribute.h>
 #include <quick-lint-js/port/span.h>
+#include <quick-lint-js/port/warning.h>
 #include <quick-lint-js/util/cast.h>
 #include <utility>
 
+QLJS_WARNING_PUSH
+QLJS_WARNING_IGNORE_GCC("-Wsuggest-final-methods")
+QLJS_WARNING_IGNORE_GCC("-Wsuggest-final-types")
+
 namespace quick_lint_js {
 // Like std::pmr::memory_resource.
 //
@@ -122,6 +127,8 @@ class Memory_Resource {
 Memory_Resource* new_delete_resource();
 }
 
+QLJS_WARNING_POP
+
 // quick-lint-js finds bugs in JavaScript programs.
 // Copyright (C) 2020  Matthew "strager" Glazar
 //