Owen Anderson d95b08a0a7 Refine the definition of convergent to only disallow the addition of new control dependencies. ...

This covers the common case of operations that cannot be sunk.
Operations that cannot be hoisted should already be handled properly via
the safe-to-speculate rules and mechanisms.

llvm-svn: 249865

2015-10-09 18:06:13 +00:00

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