Richard Sandiford c40f27b52d [SystemZ] Remove no-op MVCs ...

The stack coloring pass has code to delete stores and loads that become
trivially dead after coloring.  Extend it to cope with single instructions
that copy from one frame index to another.

The testcase happens to show an example of this kicking in at the moment.
It did occur in Real Code too though.

llvm-svn: 185705

2013-07-05 14:38:48 +00:00

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