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_decimal fails to build with --with-pydebug --with-lto on GCC #94847

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@tiran

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@tiran

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GH-94474 caused several buildbots with GCC to fail to compile _decimal module with --with-pydebug --with-lto option. The problem did not show up when I was testing my PR on the build bot farm. I can reproduce the issue locally with GCC 12.1.1. Build does not fail with non-debug builds. Only the combination of LTO and debug fails for me

../Modules/_decimal/libmpdec/mpdecimal.c: In function ‘exp_to_string’:
../Modules/_decimal/libmpdec/mpdecimal.c:143:1: error: inlining failed in call to ‘always_inline’ ‘mpd_word_digits’: function not considered for inlining
  143 | mpd_word_digits(mpd_uint_t word)
      | ^

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