Log Message:
gcc10: update to 10.4

GCC 10.4

60 bug reports were fixed.

  Target Specific Changes

    x86-64

     * The x86-64 ABI of passing and returning structures with a 64-bit
       integer vector changed in GCC 10.1 when MMX is disabled. Disabling
       MMX no longer changes how they are passed nor returned. This ABI
       change is now diagnosed with -Wpsabi.