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Kevin Bracey 03f1ac3ffd Atomics: GCC fix for M23 (ARMv8-M baseline) 
Add unified syntax directives to make the atomic assembler work when GCC
is building for M23.

GCC actually uses unified syntax when compiling C code, but puts
`.syntax divided` before each piece of inline assembly when targetting
Thumb-1 type devices like M0 and M23 for backwards compatibility. We can
overcome this with our own `.syntax unified`.  The command-line option
`-masm-syntax-unified` intended to override this globally has been
broken from GCC 6 to 8.0.
 		2019-05-29 16:48:41 +03:00
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mbed_atomic_impl.c
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mbed_atomic_impl.h
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