Add table64 lowering pass

[sbc100]

This needs to land before I can update llvm: llvm/llvm-project#92042

[sbc100]

Updated. And with feedback in a separate commit!

[sbc100]

Any idea whats up with the tsan failure. It doesn't look related:

n file included from /home/runner/work/binaryen/binaryen/src/passes/StringLowering.cpp:33:
124
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/algorithm:61:
125
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/stl_algo.h:61:
126
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/stl_tempbuf.h:263:8: error: 'get_temporary_buffer<std::unique_ptr<wasm::Global>>' is deprecated [-Werror,-Wdeprecated-declarations]
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  263 |                 std::get_temporary_buffer<value_type>(_M_original_len));
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      |                      ^
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/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/stl_algo.h:4996:15: note: in instantiation of member function 'std::_Temporary_buffer<__gnu_cxx::__normal_iterator<std::unique_ptr<wasm::Global> *, std::vector<std::unique_ptr<wasm::Global>>>, std::unique_ptr<wasm::Global>>::_Temporary_buffer' requested here
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 4996 |       _TmpBuf __buf(__first, (__last - __first + 1) / 2);
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      |               ^
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/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/stl_algo.h:5070:23: note: in instantiation of function template specialization 'std::__stable_sort<__gnu_cxx::__normal_iterator<std::unique_ptr<wasm::Global> *, std::vector<std::unique_ptr<wasm::Global>>>, __gnu_cxx::__ops::_Iter_comp_iter<(lambda at /home/runner/work/binaryen/binaryen/src/passes/StringLowering.cpp:174:7)>>' requested here
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 5070 |       _GLIBCXX_STD_A::__stable_sort(__first, __last,
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      |                       ^
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/home/runner/work/binaryen/binaryen/src/passes/StringLowering.cpp:171:10: note: in instantiation of function template specialization 'std::stable_sort<__gnu_cxx::__normal_iterator<std::unique_ptr<wasm::Global> *, std::vector<std::unique_ptr<wasm::Global>>>, (lambda at /home/runner/work/binaryen/binaryen/src/passes/StringLowering.cpp:174:7)>' requested here
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  171 |     std::stable_sort(
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      |          ^
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/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/stl_tempbuf.h:99:5: note: 'get_temporary_buffer<std::unique_ptr<wasm::Global>>' has been explicitly marked deprecated here
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   99 |     _GLIBCXX17_DEPRECATED
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      |     ^
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/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/x86_64-linux-gnu/c++/12/bits/c++config.h:119:34: note: expanded from macro '_GLIBCXX17_DEPRECATED'
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  119 | # define _GLIBCXX17_DEPRECATED [[__deprecated__]]
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      |                                  ^
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1 error generated.

[sbc100]

The tsan and asan failure apprear to be issues that also exist in main.. so I'm tempted land this despite them.

[tlively]

Yeah, looks like something on the runners changed. I think landing this is fine.