[Coverage] remove duplicated llvm profiling pass
[Coverage] remove duplicated llvm profiling pass

After we worked around Cargo's feature unification issue, we ended up
running the profiling pass twice. The second pass messes up the
checksum llvm gcov was expecting.

Closes: #1751
Approved by: bob-wilson

aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,libra/libra,libra/libra,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra