[PATCH] Expand BuildPairF64 by spilling to stack slot and reloading from it

[Daniel Sanders]

> ...  so I could do both in the same patch if you like.

Just fixing some poor phrasing I noticed after clicking send. I mean I could add the FPXX code to handle move from FPU at the same time as I add the code to handle FP64A move to/from FPU.

http://reviews.llvm.org/D4465