ping**3 [PATCH, ARM] Cortex-A9 MPCore volatile load workaround

[Sandra Loosemore]

Chung-Lin posted this patch last year but it seems never to have been 
reviewed:

https://gcc.gnu.org/ml/gcc-patches/2014-06/msg00714.html
I've just re-applied and re-tested it and it still seems to be good. 
Can somebody please take a look at it?

-Sandra