Evan Cheng 4dc848f3e8 Let each target determines whether a machine instruction is dead. If true, that allows late codeine passes to delete it. ...

This is considered a workaround. The problem is some targets are not modeling side effects correctly. PPC is apparently one of those. This patch allows ppc llvm-gcc to bootstrap on Darwin. Once we find out which instruction definitions are wrong, we can remove the PPCInstrInfo workaround.

llvm-svn: 76703

2009-07-22 00:25:27 +00:00

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