[RX] Fix PR 81819

[Oleg Endo]

Hi,

The attached patch fixes PRÂ 81819, which popped up on GCC 7. Â I assume
it's also there on trunk, but can't build my app with trunk compiler
because it's got other issues.

Unfortunately I can't add the reproducer test case since it happens
only when building a bigger app with LTO. Â But I have confirmed that
with this fix the app builds and runs.

OK for trunk and GCC 7?

Cheers,
Oleg

gcc/ChangeLog:
	PR target/81819
	* config/rx/rx.c (rx_is_restricted_memory_address):
	Handle SUBREG case.
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