Issue was due to messed up SRAM define in linker script.  IDK what
datasheet I was reading..  But I had the location and size completely
wrong.  That caused any access of SRAM to cause a hardfault of course.
First happening when popping anything to the stack.  Which also explains
why I couldn't look at the stack to figure out the last called instruciton
to point to where the issue was...

copied stm32f0xx_*.h files over from STM32F0xx_StdPeriph_Driver/inc dir