[TF-M] build with GNUARM with option -Os

Hello, I tested my board port on top of 1c266ae74bd93c2ef290e9aac0caecf92b06b93d Without option -Os , the tests with ConfigCoreIPC.cmake are passed . When I put the option -Os , 1st test is failing in Hardware Fault.

For info, the test with ConfigRegression.cmake and option -Os is passed .

With the configuration -Os , code footprint is much better.

Is it plan to activate this option in master ? Is the same issue reproduced on another board ?

Best regards