Commits on Jan 25, 2024

1. Unconditionally lower std::string's alignment requirement from 16 to … …

   …8. (llvm#68925)
   
   Unconditionally change std::string's alignment to 8.
   
   This change saves memory by providing the allocator more freedom to
   allocate the most
   efficient size class by dropping the alignment requirements for
   std::string's
   pointer from 16 to 8. This changes the output of std::string::max_size,
   which makes it ABI breaking.
   
   That said, the discussion concluded that we don't care about this ABI
   break. and would like this change enabled universally.
   
   The ABI break isn't one of layout or "class size", but rather the value
   of "max_size()" changes, which in turn changes whether `std::bad_alloc`
   or `std::length_error` is thrown for large allocations.
   
   This change is the child of PR llvm#68807, which enabled the change behind
   an ABI flag.

   

   EricWF committed Jan 25, 2024
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