Chris Lattner 5eb8094c2d Patch to fix PR337. Make sure to mark all aliased physical registers as used ...

when we see a read of a register.  This is important in cases like:

AL = ...
AH = ...

   = AX

The read of AX must make both the AL and AH defs live until the use.

llvm-svn: 13444

2004-05-10 05:12:43 +00:00

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