[LLVMdev] Representing -ffast-math at the IR level

[Duncan Sands]

Here's a revised patch, plus patches showing how fpmath metadata could be
turned on in clang and dragonegg (it seemed safest for the moment to
condition on -ffast-math rather than on one of the flags implied by
-ffast-math).

Major changes:

- The FPMathOperator class can no longer be used to change math settings,
only to read them.  Currently it can be queried for accuracy info.  I split
the accuracy methods into two: one for 'fast' accuracy, one for a numerical
accuracy (which returns +infty when the accuracy is 'fast').

- MDBuilder got support for creating fpmath metadata, in particular there is
function that returns the appropriate settings for -ffast-math.

- A default fpmath setting can be supplied to IRBuilder, which will then apply
it to all floating point operations.  It is also possible to specify specific
fpmath metadata when creating an operation.

Ciao, Duncan.
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