[PATCH] Add hidden visibility to internal function prototypes

[Florian Weimer]

On 08/22/2017 02:16 PM, H.J. Lu wrote:
> Only targets which use stdlib/rshift.c have this issue.  This patch
> copies the debug approach from stdlib/lshift.c and works on aarch64,

I think the existing assert better reflects the actual intent here.  We
should use assert in stdlib/lshift.c as well.

With staticaly linked tests, the use of __assert_fail is a non-issue.

Thanks,
Florian