* check/ldstr.ok, check/ldstr.tst, check/ldsti.ok,
check/ldsti.tst, check/ldstxr.ok, check/ldstxr.tst,
check/ldstxi.ok, check/ldstxi.tst:
New test case files exercising a very large amount of
register combinations to verify load/store implementation.
* check/Makefile.am: Update for new test cases.
* lib/jit_x86-cpu.c: Correct wrong argument order when
computing REX prefix for {ld,st}r_T codes;
