Change Details

* Fixed UB(arithmetics on uninit values) in cmovs * Add valgrind uninit check to cmovs output This is a backport of libsecp256k1 PR754

* Fixed UB(arithmetics on uninit values) in cmovs * Add valgrind uninit check to cmovs output This is a backport of libsecp256k1 [[https://github.com/bitcoin-core/secp256k1/pull/754 | PR754]]

* Fixed UB(arithmetics on uninit values) in cmovs * Add valgrind uninit check to cmovs output This is a backport of libsecp256k1 [[https://github.com/bitcoin-core/secp256k1/pull/754 | PR754]]