REX: Set REX bits in accordance with 32-register environment

REX.RXB bits were set for high-8 registers previously.
Since high-16 zmm registers are newly added, those bits should
be set as one bit of binary number of register value.
Similarly EVEX.R'/V'/X should be set in the same manner.

Authored-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Jin Kyu Song <jin.kyu.song@intel.com>
Add (redundant) parentheses around bit tests mixed with &&

It is easy to get confused when mixing & and &&, so add redundant
parenteses for clarity.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
BR3392270: preproc: Handle all token chains in mmacro params range

A typical example is

|
| %macro m0 0-*
|     %rep %0
|         m0 arg is %1
|         %rotate 1
|     %endrep
| %endmacro
|
| %macro m1 0-*
|     m0 %{1:-1}
| %endmacro
|
| m1 a=b, c=d

If passed with nasm -E the output must be like

 m0 arg is a=b
 m0 arg is c=d

http://bugzilla.nasm.us/show_bug.cgi?id=3392270

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>