[PATCH] compiler.h: Fix barrier_data() on clang

[Andreas Schwab]

On Nov 16 2020, Nick Desaulniers wrote:

> A lot of VDSO's reset KBUILD_CFLAGS or use a new variable for their
> compiler flags.  As such, they're missing `-include` command line flag
> that injects include/linux/compiler_types.h,

It's not missing here.

Andreas.

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Andreas Schwab, schwab at linux-m68k.org
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