Rename %eflags to %rflags.

EFLAGS is a subregister of RFLAGS. For consistency with GPRs where we
use the 64-bit names to refer to the registers, use the 64-bit name for
RFLAGS as well.

lib/cretonne/meta/isa/intel/registers.py

@@ -43,7 +43,7 @@ FlagRegs = RegBank(
         'Flag registers',
         units=1,
         pressure_tracking=False,
-        names=['eflags'])
+        names=['rflags'])
 
 GPR = RegClass(IntRegs)
 # Certain types of deref encodings cannot be used with all registers.