[GR-44110] Add -march option and target x86-64-v3 by default.

[graalvmbot]

This PR adds a new -march option to Native Image:

    -march                generate instructions for a specific machine type. Defaults to
                          'x86-64-v3' on AMD64 and 'armv8-a' on AArch64. Use
                          -march=compatibility for best compatibility, or -march=native for
                          best performance if the native executable is deployed on the same
                          machine or on a machine with the same CPU features. To list all
                          available machine types, use -march=list.

x86-64-v3 is the new default on AMD64 and allows the Graal compiler to generate AVX and other widespread CPU instructions, which can significantly improve the run-time performance of native executables. If you or the users of your application want to deploy on machines with older CPUs, use -march=compatibility to re-enable the previous default. Use -march=native for best performance if the native executable is deployed on the same machine or on a machine with the same CPU features. To list all available machine types, use -march=list.