Sanjay Patel b2325b9ab3 Fix a logic bug when copying fast-math flags. ...

"Setting" does not equal "copying". This bug has sat dormant for 2 reasons:
1. The unit test was not adequate.
2. Every current user of the "copyFastMathFlags" API is operating on a new instruction.
   (ie, all existing fast-math flags are off). If you copy flags to an existing
   instruction that has some flags on already, you will not necessarily turn them off
   as expected.

I uncovered this bug while trying to implement a fix for PR20802.

llvm-svn: 216939

2014-09-02 20:03:00 +00:00

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