asan: add ldelf support and user shadow mapping infrastructure

This commit enables ASan support in ldelf and introduces infrastructure
for mapping ASan shadow regions in user space. With these chang

asan: add ldelf support and user shadow mapping infrastructure

This commit enables ASan support in ldelf and introduces infrastructure
for mapping ASan shadow regions in user space. With these changes,
ASan built with CFG_CORE_SANITIZE_KADDRESS is no longer limited to
the core and can also operate in ldelf.

Signed-off-by: Aleksandr Iashchenko <aleksandr.iashchenko@linutronix.de>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

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