* check/float.ok, check/float.tst: New test cases implementing
extensive validation of float comparison and branch code
generation as well as integer conversion, involving NaN and
[+-]Inf.
* lib/jit_arm-swf.c, lib/jit_x86-sse.c, lib/jit_x86-x87.c:
Correct bugs found by new float test case.
* lib/jit_x86.c: Correct cut&paste error added in commit to
convert jit_arg* return value to a jit_node_t*, that would
cause it to not properly handle double arguments in ix86.
* check/Makefile.am: Update for the new test case.
