Fix size test build on gcc11

[lucylq]

Summary

Fix size-test on gcc11 (not a binary size improvement)

It fails with stringop-overread from flatbuffer. gcc-9 doesn't have this and doesn't throw error.

In static member function ‘static constexpr std::size_t std::char_traits<char>::length(const char_type*)’,
    inlined from ‘constexpr std::basic_string_view<_CharT, _Traits>::basic_string_view(const _CharT*) [with _CharT = char; _Traits = std::char_traits<char>]’ at /usr/include/c++/11/string_view:132:35,
    inlined from ‘executorch::runtime::Result<void*> executorch::runtime::deserialization::getTensorDataPtr(const executorch_flatbuffer::Tensor*, const executorch::runtime::Program*, size_t, executorch::runtime::HierarchicalAllocator*, const executorch::runtime::NamedDataMap*, executorch::runtime::Span<executorch::runtime::deserialization::NamedData>)’ at /data/users/lfq/binary-size/executorch/runtime/executor/tensor_parser_exec_aten.cpp:218:41:
/usr/include/c++/11/bits/char_traits.h:399:32: error: ‘long unsigned int __builtin_strlen(const char*)’ reading 1 or more bytes from a region of size 0 [-Werror=stringop-overread]
  399 |         return __builtin_strlen(__s);
      |                ~~~~~~~~~~~~~~~~^~~~~
In file included from /data/users/lfq/binary-size/executorch/../executorch/runtime/executor/tensor_parser.h:21,
                 from /data/users/lfq/binary-size/executorch/runtime/executor/tensor_parser_exec_aten.cpp:9:
/data/users/lfq/binary-size/executorch/cmake-out/schema/include/executorch/schema/program_generated.h: In function ‘executorch::runtime::Result<void*> executorch::runtime::deserialization::getTensorDataPtr(const executorch_flatbuffer::Tensor*, const executorch::runtime::Program*, size_t, executorch::runtime::HierarchicalAllocator*, const executorch::runtime::NamedDataMap*, executorch::runtime::Span<executorch::runtime::deserialization::NamedData>)’:
/data/users/lfq/binary-size/executorch/cmake-out/schema/include/executorch/schema/program_generated.h:568:8: note: at offset 5 into source object ‘executorch_flatbuffer::ExtraTensorInfo::<anonymous>’ of size 1
  568 | struct ExtraTensorInfo FLATBUFFERS_FINAL_CLASS : private ::flatbuffers::Table {

Test plan

Flatbuffer should be ok - add -Wno-stringop-overread to suppress the error. Use pragma because adding it in CXX_ARGS causes a failure, as gcc-9 doesn't recognize it and -Werror is enabled.

size results after stripping

sh test/build_size_test.sh 

(executorch) [lfq@devvm11764.nha0 /data/users/lfq/binary-size/executorch (binary-size)]$ ls -la cmake-out/test/size_test_all_ops
-rwxr-xr-x 1 lfq users 1670416 Mar  4 22:37 cmake-out/test/size_test_all_ops

(executorch) [lfq@devvm11764.nha0 /data/users/lfq/binary-size/executorch (binary-size)]$ ls -la cmake-out/test/size_test
-rwxr-xr-x 1 lfq users 56240 Mar  4 22:38 cmake-out/test/size_test

[lucylq]

Stack from ghstack (oldest at bottom):

• Mark Kernel and KernelKey constructors constexpr #17909
• Use direct function pointers for et_copy_index and et_view in prim_ops #17908
• Export ET_LOG_ENABLED=0 as PUBLIC compile definition on cmake targets #17907
• Suppress .eh_frame generation when EXECUTORCH_OPTIMIZE_SIZE is ON #17906
• -> Fix size test build on gcc11 #17905

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17905

• 📄 Preview Python docs built from this PR

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❌ 2 New Failures, 13 Pending, 2 Unrelated Failures

As of commit cf6ca45 with merge base 75f5a76 ():

NEW FAILURES - The following jobs have failed:

• Test CUDA Builds / export-model-cuda-artifact (nvidia, diar_streaming_sortformer_4spk-v2, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t c4d5864c58ef66b8b3c08a80b34499ea71254dca6717df2fb077d3de02bae4b8 /exec failed with exit code 1
• Test CUDA Windows Export and E2E / export-model-cuda-windows-artifact (nvidia, diar_streaming_sortformer_4spk-v2, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t da7f887717b8d14fe263a09ba17a8ddf8372e09877f83ae008ebf55fd9ad39db /exec failed with exit code 1

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / macos / macos-job (gh) (trunk failure)
  AttributeError: '_OpNamespace' 'mkldnn' object has no attribute '_is_mkldnn_acl_supported'
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  AttributeError: '_OpNamespace' 'mkldnn' object has no attribute '_is_mkldnn_acl_supported'

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