[PATCH] Allow constant folding of fma and fmuladd

[Matt Arsenault]

================
Comment at: lib/Analysis/ConstantFolding.cpp:1640
@@ +1639,3 @@
+        default: break;
+#if HAVE_FMA
+        case Intrinsic::fma:
----------------
hfinkel at anl.gov wrote:
> I'm confused as to why you're doing this? Can't APFloat compute the FMA properly regardless of the host capabilities?
> 
> Furthermore, if you do it this way, it looks like the answer might be wrong depending on how the compiler was configured?
I forgot APFloat had this already, and for fmuladd it's not supposed to matter. I'll fix it to use APFloat


http://llvm-reviews.chandlerc.com/D2951