RunONNXModel.py: save compilation info into a file when using --save-model or --cache-model

[tungld]

When using --save-model=save_folder or --cache-model=save_folder, a file compile.log is created inside save_folder that contains all the compilation log printed out by the compiler.

This is helpful to know how a model was compiled.

[AlexandreEichenberger]

LGTM,
I was actually thinking that we could just save the content of the command (actually the content of the -c argument), and that way we could even "reset" the cache if the options are different.

[jenkins-droid]

Jenkins Linux amd64 Build #15923 [push] Save compilation info in... started at 08:06

[jenkins-droid]

Jenkins Linux ppc64le Build #14954 [push] Save compilation info in... started at 09:20

[jenkins-droid]

Jenkins Linux s390x Build #15927 [push] Save compilation info in... started at 09:07

[tungld]

I was actually thinking that we could just save the content of the command (actually the content of the -c argument), and that way we could even "reset" the cache if the options are different.

Coincidently, I have the same thought about compile flags :)

[jenkins-droid]

Jenkins Linux ppc64le Build #14954 [push] Save compilation info in... failed after 1 hr 42 min

[jenkins-droid]

Jenkins Linux s390x Build #15927 [push] Save compilation info in... passed after 2 hr 4 min

[jenkins-droid]

Jenkins Linux amd64 Build #15923 [push] Save compilation info in... passed after 2 hr 5 min