[RISCV] Swap encodings of max and minu to match 0.93 bitmanip spec.

[frasercrmck]

LGTM

[craig.topper]

Rebase

llvm/lib/Target/RISCV/RISCVInstrInfoB.td

 let Predicates = [HasStdExtZbc] in {
 def CLMUL  : ALU_rr<0b0000101, 0b001, "clmul">, Sched<[]>;
 def CLMULR : ALU_rr<0b0000101, 0b010, "clmulr">, Sched<[]>;
 def CLMULH : ALU_rr<0b0000101, 0b011, "clmulh">, Sched<[]>;
 } // Predicates = [HasStdExtZbc]
 
 let Predicates = [HasStdExtZbb] in {
 def MIN  : ALU_rr<0b0000101, 0b100, "min">, Sched<[]>;
-def MAX  : ALU_rr<0b0000101, 0b101, "max">, Sched<[]>;
-def MINU : ALU_rr<0b0000101, 0b110, "minu">, Sched<[]>;
+def MINU : ALU_rr<0b0000101, 0b101, "minu">, Sched<[]>;
+def MAX  : ALU_rr<0b0000101, 0b110, "max">, Sched<[]>;
 def MAXU : ALU_rr<0b0000101, 0b111, "maxu">, Sched<[]>;
 } // Predicates = [HasStdExtZbb]
 
 let Predicates = [HasStdExtZbp] in {
 def SHFL   : ALU_rr<0b0000100, 0b001, "shfl">, Sched<[]>;
 def UNSHFL : ALU_rr<0b0000100, 0b101, "unshfl">, Sched<[]>;
 } // Predicates = [HasStdExtZbp]
 

llvm/test/MC/RISCV/rv32zbb-valid.s

 # CHECK-ASM: encoding: [0x93,0x12,0x43,0x60]
 sext.b t0, t1
 # CHECK-ASM-AND-OBJ: sext.h t0, t1
 # CHECK-ASM: encoding: [0x93,0x12,0x53,0x60]
 sext.h t0, t1
 # CHECK-ASM-AND-OBJ: min t0, t1, t2
 # CHECK-ASM: encoding: [0xb3,0x42,0x73,0x0a]
 min t0, t1, t2
-# CHECK-ASM-AND-OBJ: max t0, t1, t2
-# CHECK-ASM: encoding: [0xb3,0x52,0x73,0x0a]
-max t0, t1, t2
 # CHECK-ASM-AND-OBJ: minu t0, t1, t2
-# CHECK-ASM: encoding: [0xb3,0x62,0x73,0x0a]
+# CHECK-ASM: encoding: [0xb3,0x52,0x73,0x0a]
 minu t0, t1, t2
+# CHECK-ASM-AND-OBJ: max t0, t1, t2
+# CHECK-ASM: encoding: [0xb3,0x62,0x73,0x0a]
+max t0, t1, t2
 # CHECK-ASM-AND-OBJ: maxu t0, t1, t2
 # CHECK-ASM: encoding: [0xb3,0x72,0x73,0x0a]
 maxu t0, t1, t2