Adds a fused multiply-add operation to the Float module.
The following changes are made:
- configure: check math.h for the C99 fma() operation.
- fma declarations in float.ml[i] (stdlib/).
- C fma() call or emulation in runtime/floats.c.
- dedicated tests in testsuite/tests/fma.
- inline Pervasives in Stdlib and re-add Pervasives as a deprecated
module that aliases all elements of Stdlib except the stdlib modules.
- remove special case for Stdlib.Pervasives in printtyp.ml
Damien Doligez
Laurent Thévenoux
Christophe Troestler
Jérémie Dimino
David Allsopp
Nicolás Ojeda Bär