arm: Add __aeabi_memclr in eabi_compat

LLVM's code generator will sometimes emit calls to __aeabi_memclr. Add an
implementation of this for LLVM compatibility.

Signed-off-by: Sam Edwards <CFSworks@gmail.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
1 file changed