Pedro Artigas caa565887d Added a TLI hook to signal that the target does not have or does not care about ...

floating point exceptions, added use of flag to fold potentially exception 
raising floating point math in selection DAG. No functionality change, as 
targets have to explicitly ask for this behavior and none does today.

llvm-svn: 215222

2014-08-08 16:46:53 +00:00

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