Fix tst-obprintf - and mcheck in general

[Andreas Schwab]

Andreas Jaeger <aj@suse.com> writes:

> One option is to compile with -fno-builtin-malloc, the alternative would be 
> to use some otherways to initialize the malloc implementation.

Does it work to use the equivalent of math_opt_barrier from
<math_private.h>?

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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