[PATCH][ARM][cleanup] Remove uses of CONST_DOUBLE_HIGH/LOW

[Kyrill Tkachov]

Hi all,

This cleanup patch removes handling of CONST_DOUBLE rtxes that carry large integers.
These should never be passed down from the midend and the arm backend doesn't create them.
The code has been there since 2007 but the arm backend was moved to TARGET_SUPPORTS_WIDE_INT
in 2014, so this path should never be taken.

Bootstrapped and tested on arm-none-linux-gnueabihf.

Ok for trunk?

Thanks,
Kyrill

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