migrate Zbb-Extension opcodes

- aliases have been revised to use $pseudo_op syntax
- split the instructions into multiple files as per new file naming policy
- some pseudo ops depend on unratified instructions.

rv32_zbb

@@ -0,0 +1,3 @@
+$pseudo_op rv_zbe::pack     zext.h rd rs1 31..25=0x04 24..20=0 14..12=0x4 6..0=0x33 
+$pseudo_op rv64_zbp::grevi  rev8 rd rs1   31..20=0x698 14..12=5 6..0=0x13
+$pseudo_op rv64_zbb::rori   rori rd rs1   31..25=0x30 shamtw 14..12=5 6..2=0x04 1..0=3

rv64_zbb

@@ -0,0 +1,9 @@
+clzw  rd rs1                                31..20=0x600 14..12=1 6..2=0x06 1..0=3
+ctzw  rd rs1                                31..20=0x601 14..12=1 6..2=0x06 1..0=3
+cpopw rd rs1                                31..20=0x602 14..12=1 6..2=0x06 1..0=3
+rolw  rd rs1 rs2                            31..25=0x30 14..12=1 6..2=0x0E 1..0=3
+rorw  rd rs1 rs2                            31..25=0x30 14..12=5 6..2=0x0E 1..0=3
+roriw rd rs1                                31..25=0x30 shamtw 14..12=5 6..2=0x06 1..0=3
+rori  rd rs1                                31..26=0x18 shamt 14..12=5 6..2=0x04 1..0=3
+$pseudo_op rv64_zbe::packw zext.h rd rs1    31..25=0x04 24..20=0 14..12=0x4 6..2=0xE 1..0=0x3 
+$pseudo_op rv64_zbp::grevi rev8 rd rs1      31..20=0x6B8 14..12=5 6..0=0x13

opcodes-rv32zbb → rv_zbb

@@ -1,24 +1,15 @@
 andn       rd rs1 rs2 31..25=32 14..12=7 6..2=0x0C 1..0=3
 orn        rd rs1 rs2 31..25=32 14..12=6 6..2=0x0C 1..0=3
 xnor       rd rs1 rs2 31..25=32 14..12=4 6..2=0x0C 1..0=3
-
-rol        rd rs1 rs2 31..25=48 14..12=1 6..2=0x0C 1..0=3
-ror        rd rs1 rs2 31..25=48 14..12=5 6..2=0x0C 1..0=3
-
-rori       rd rs1 31..26=24 shamt 14..12=5 6..2=0x04 1..0=3
-
 clz        rd rs1 31..20=0x600 14..12=1 6..2=0x04 1..0=3
 ctz        rd rs1 31..20=0x601 14..12=1 6..2=0x04 1..0=3
 cpop       rd rs1 31..20=0x602 14..12=1 6..2=0x04 1..0=3
-sext.b     rd rs1 31..20=0x604 14..12=1 6..2=0x04 1..0=3
-sext.h     rd rs1 31..20=0x605 14..12=1 6..2=0x04 1..0=3
-
-min        rd rs1 rs2 31..25=5 14..12=4 6..2=0x0C 1..0=3
-minu       rd rs1 rs2 31..25=5 14..12=5 6..2=0x0C 1..0=3
 max        rd rs1 rs2 31..25=5 14..12=6 6..2=0x0C 1..0=3
 maxu       rd rs1 rs2 31..25=5 14..12=7 6..2=0x0C 1..0=3
-
-orc.b      rd rs1 31..26=10 25..20=7 14..12=5 6..2=0x04 1..0=3
-
-@rev8.rv32   rd rs1 31..26=26 25..20=24 14..12=5 6..2=0x04 1..0=3
-@zext.h.rv32 rd rs1 31..25=4  24..20=0  14..12=4 6..2=0x0C 1..0=3
+min        rd rs1 rs2 31..25=5 14..12=4 6..2=0x0C 1..0=3
+minu       rd rs1 rs2 31..25=5 14..12=5 6..2=0x0C 1..0=3
+sext.b     rd rs1 31..20=0x604 14..12=1 6..2=0x04 1..0=3
+sext.h     rd rs1 31..20=0x605 14..12=1 6..2=0x04 1..0=3
+rol        rd rs1 rs2 31..25=0x30 14..12=1 6..2=0x0C 1..0=3
+ror        rd rs1 rs2 31..25=0x30 14..12=5 6..2=0x0C 1..0=3
+$pseudo_op rv64_zbp::gorci orc.b rd rs1 31..20=0x287 14..12=0x5 6..0=0x13