Improve reload inheritance code generation and predictability

[Jeff Law]

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Original patch discussion here:


http://gcc.gnu.org/ml/gcc-patches/2010-11/msg01917.html

This version results in about a .15% compile-time slowdown.  In return
we get better code generation (size & speed) through improved
inheritance and more predictable inheritance (which should save
developer time ;-)

http://gcc.gnu.org/bugzilla/attachment.cgi?id=22603


I've done a fresh bootstrap and regression test on
x86_64-unknown-linux-gnu.  OK?

Jeff
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