David Majnemer 0a92f86fe6 Revert r246232 and r246304. ...

This reverts isSafeToSpeculativelyExecute's use of ReadNone until we
split ReadNone into two pieces: one attribute which reasons about how
the function reasons about memory and another attribute which determines
how it may be speculated, CSE'd, trap, etc.

llvm-svn: 246331

2015-08-28 21:13:39 +00:00

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