Peter Collingbourne e2b8c40a77 ELF: Use bump pointer allocator for uncompressed section buffers. NFCI. ...

This shaves another word off SectionBase and makes it possible to clone a
section using the implicit copy constructor.

This basically reverts r311056, which removed the mutex in order to
make the code easier to understand. On balance I think it's probably more
straightforward to have a mutex here than to have an unusual copy constructor
in SectionBase.

Differential Revision: https://reviews.llvm.org/D59269

llvm-svn: 355966

2019-03-12 20:32:30 +00:00

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