from  Benoît Perrot  <benoit@lrde.epita.fr>

	Limit access to callee-save and caller-save registers.

	* dev/inst-solver-gen.py:
	Check use of callee-save and caller-save registers.
	* src/inst/inst-tasks.hh, src/inst/inst-tasks.cc:
	Add coresponding tasks.