Add CMN instruction to ARM integrated assembler.

tests_lit/assembler/arm32/cmn.ll

+; Show that we know how to encode CMN in the ARM integrated assembler.
+
+; REQUIRES: allow_dump
+
+; Compile using standalone assembler.
+; RUN: %p2i --filetype=asm -i %s --target=arm32 --args -Om1 \
+; RUN:   | FileCheck %s --check-prefix=ASM
+
+; Show bytes in assembled standalone code.
+; RUN: %p2i --filetype=asm -i %s --target=arm32 --assemble --disassemble \
+; RUN:   --args -Om1 | FileCheck %s --check-prefix=DIS
+
+; Compile using integrated assembler.
+; RUN: %p2i --filetype=iasm -i %s --target=arm32 --args -Om1 \
+; RUN:   | FileCheck %s --check-prefix=IASM
+
+; Show bytes in assembled integrated code.
+; RUN: %p2i --filetype=iasm -i %s --target=arm32 --assemble --disassemble \
+; RUN:   --args -Om1 | FileCheck %s --check-prefix=DIS
+
+define internal i32 @testCmn(i32 %a) {
+; ASM-LABEL:testCmn:
+; DIS-LABEL:00000000 <testCmn>:
+; IASM-LABEL:testCmn:
+
+entry:
+; ASM-NEXT:.LtestCmn$entry:
+; IASM-NEXT:.LtestCmn$entry:
+
+; ASM-NEXT:     sub     sp, sp, #12
+; DIS-NEXT:   0:        e24dd00c
+; IASM-NEXT:    .byte 0xc
+; IASM-NEXT:    .byte 0xd0
+; IASM-NEXT:    .byte 0x4d
+; IASM-NEXT:    .byte 0xe2
+
+; ASM-NEXT:     str     r0, [sp, #8]
+; ASM-NEXT:     # [sp, #8] = def.pseudo 
+; DIS-NEXT:   4:        e58d0008
+; IASM-NEXT:    .byte 0x8
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x8d
+; IASM-NEXT:    .byte 0xe5
+
+  %cmp = icmp sgt i32 %a, -1
+
+; ASM-NEXT:     mov     r0, #0
+; DIS-NEXT:   8:        e3a00000
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0xa0
+; IASM-NEXT:    .byte 0xe3
+
+; ASM-NEXT:     ldr     r1, [sp, #8]
+; DIS-NEXT:   c:        e59d1008
+; IASM-NEXT:    .byte 0x8
+; IASM-NEXT:    .byte 0x10
+; IASM-NEXT:    .byte 0x9d
+; IASM-NEXT:    .byte 0xe5
+
+; ASM-NEXT:     cmn     r1, #1
+; DIS-NEXT:  10:        e3710001
+; IASM-NEXT:    .byte 0x1
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x71
+; IASM-NEXT:    .byte 0xe3
+
+  %cmp.ret_ext = zext i1 %cmp to i32
+  ret i32 %cmp.ret_ext
+}