Generate FSQRT from calls to the sqrt function, which allows appropriate backends to generate a sqrt instruction.
Generate FSQRT from calls to the sqrt function, which
allows appropriate backends to generate a sqrt instruction.

On x86, this isn't done at -O0 because we go through
FastISel instead.  This is a behavior change from before
this series of sqrt patches started.  I think this is OK
considering that compile speed is most important at -O0, but
could be convinced otherwise.



git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@82778 91177308-0d34-0410-b5e6-96231b3b80d8

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