[patch] alias.c TLC

[Steven Bosscher]

Hello,

The attached patch does some maintenance on alias.c:

* Change reg_known_value from "rtx *" to a VEC(rtx).
* Change reg_known_equiv_p from "char *" to an sbitmap.

Nothing spectacular, just maintenance.

Bootstrapped and regtested on x86_64-unknown-linux-gnu. OK?

Ciao!
Steven

alias_tlc.diff
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