Add RSB instruction to the ARM integrated assembler.

tests_lit/assembler/arm32/rsb.ll

+; Show that we know how to translate rsb. Uses shl as example, because it
+; uses rsb for type i64
+  
+; 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 i64 @shiftLeft(i64 %v, i64 %l) {
+; ASM-LABEL:shiftLeft:
+; DIS-LABEL:00000000 <shiftLeft>:
+; IASM-LABEL:shiftLeft:
+
+entry:
+; ASM-NEXT:.LshiftLeft$entry:
+; IASM-NEXT:.LshiftLeft$entry:
+
+; ASM-NEXT:     sub     sp, sp, #24
+; DIS-NEXT:   0:        e24dd018
+; IASM-NEXT:    .byte 0x18
+; IASM-NEXT:    .byte 0xd0
+; IASM-NEXT:    .byte 0x4d
+; IASM-NEXT:    .byte 0xe2
+
+; ASM-NEXT:     str     r0, [sp, #20]
+; ASM-NEXT:     # [sp, #20] = def.pseudo 
+; DIS-NEXT:   4:        e58d0014
+; IASM-NEXT:    .byte 0x14
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x8d
+; IASM-NEXT:    .byte 0xe5
+
+; ASM-NEXT:     mov     r0, r1
+; DIS-NEXT:   8:        e1a00001
+; IASM-NEXT:    .byte 0x1
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0xa0
+; IASM-NEXT:    .byte 0xe1
+
+; ASM-NEXT:     str     r0, [sp, #16]
+; ASM-NEXT:     # [sp, #16] = def.pseudo 
+; DIS-NEXT:   c:        e58d0010
+; IASM-NEXT:    .byte 0x10
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x8d
+; IASM-NEXT:    .byte 0xe5
+
+; ASM-NEXT:     mov     r0, r2
+; DIS-NEXT:  10:        e1a00002
+; IASM-NEXT:    .byte 0x2
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0xa0
+; IASM-NEXT:    .byte 0xe1
+
+; ASM-NEXT:     str     r0, [sp, #12]
+; ASM-NEXT:     # [sp, #12] = def.pseudo 
+; DIS-NEXT:  14:        e58d000c
+; IASM-NEXT:    .byte 0xc
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x8d
+; IASM-NEXT:    .byte 0xe5
+
+; ASM-NEXT:     mov     r0, r3
+; DIS-NEXT:  18:        e1a00003
+; IASM-NEXT:    .byte 0x3
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0xa0
+; IASM-NEXT:    .byte 0xe1
+
+; ASM-NEXT:     str     r0, [sp, #8]
+; ASM-NEXT:     # [sp, #8] = def.pseudo 
+; DIS-NEXT:  1c:        e58d0008
+; IASM-NEXT:    .byte 0x8
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x8d
+; IASM-NEXT:    .byte 0xe5
+
+  %result = shl i64 %v, %l
+
+; ASM-NEXT:     ldr     r0, [sp, #20]
+; DIS-NEXT:  20:        e59d0014
+; IASM-NEXT:    .byte 0x14
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x9d
+; IASM-NEXT:    .byte 0xe5
+
+; ASM-NEXT:     ldr     r1, [sp, #16]
+; DIS-NEXT:  24:        e59d1010
+; IASM-NEXT:    .byte 0x10
+; IASM-NEXT:    .byte 0x10
+; IASM-NEXT:    .byte 0x9d
+; IASM-NEXT:    .byte 0xe5
+
+; ASM-NEXT:     ldr     r2, [sp, #12]
+; DIS-NEXT:  28:        e59d200c
+; IASM-NEXT:    .byte 0xc
+; IASM-NEXT:    .byte 0x20
+; IASM-NEXT:    .byte 0x9d
+; IASM-NEXT:    .byte 0xe5
+
+; ****** Here is the example of rsb *****
+; ASM-NEXT:     rsb     r3, r2, #32
+; DIS-NEXT:  2c:        e2623020
+; IASM-NEXT:    .byte 0x20
+; IASM-NEXT:    .byte 0x30
+; IASM-NEXT:    .byte 0x62
+; IASM-NEXT:    .byte 0xe2
+
+  ret i64 %result
+}