[test] Suppress a bogus warning on GCC 11.4

GCC warns, even though this entire loop is guarded by `n <= size_`
and we humans know that `size_ <= N`.

    In file SG14/test/aa_inplace_vector_smallsize_test.cpp:3:
    SG14/include/sg14/aa_inplace_vector.h: In member function ‘virtual void aa_inplace_vector_smallsize_ConstructorsThrow_Test::TestBody()’:
    SG14/include/sg14/aa_inplace_vector.h:635:28: error: iteration 3 invokes undefined behavior [-Werror=aggressive-loop-optimizations]
      635 |                 (*this)[i] = value;
          |                 ~~~~~~~~~~~^~~~~~~
    SG14/include/sg14/aa_inplace_vector.h:634:34: note: within this loop
      634 |             for (size_t i = 0; i < n; ++i) {
          |                                ~~^~~

test/CMakeLists.txt

@@ -36,6 +36,8 @@ if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
   set_property(TARGET utest APPEND PROPERTY COMPILE_OPTIONS "-Wall;-Wextra;-Werror")
 elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
   set_property(TARGET utest APPEND PROPERTY COMPILE_OPTIONS "-Wall;-Wextra;-Werror")
+  # GCC 11 gives bogus warning "iteration 3 invokes undefined behavior"
+  set_property(SOURCE aa_inplace_vector_smallsize_test.cpp APPEND PROPERTY COMPILE_OPTIONS "-Wno-aggressive-loop-optimizations")
   # GCC 13 gives bogus warnings on local types with typedefs
   set_property(SOURCE hive_test.cpp APPEND PROPERTY COMPILE_OPTIONS "-Wno-unused-local-typedefs")
   if (CMAKE_CXX_COMPILER_VERSION MATCHES "^7.*")