Commits on Apr 11, 2023

1. ct: Use volatile "trick" in all fe/scalar cmov implementations …

   Apparently clang 15 is able to compile our cmov code into a branch,
   at least for fe_cmov and fe_storage_cmov. This commit makes the
   condition volatile in all cmov implementations (except ge but that
   one only calls into the fe impls).
   
   This is just a quick fix. We should still look into other methods,
   e.g., asm and #457. We should also consider not caring about
   constant-time in scalar_low_impl.h
   
   We should also consider testing on very new compilers in nightly CI,
   see bitcoin-core/secp256k1#864 (comment)

   

   real-or-random committed Apr 11, 2023
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