Makes the registers saved at hardfault_entry be global volatile. The previous code was actually optimized out by the compiler.
Makes the registers saved at hardfault_entry be global volatile. The previous code was actually optimized out by the compiler.

bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn