Jakob Stoklund Olesen 5bfec69b1d Add VirtRegMap::rewrite() and use it in the new register allocators. ...

The rewriter works almost identically to -rewriter=trivial, except it also
eliminates any identity copies.

This makes the new register allocators independent of VirtRegRewriter.cpp which
will be going away at the same time as RegAllocLinearScan.

llvm-svn: 125967

2011-02-18 22:03:18 +00:00

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