Add SDIV to ARM integrated assembler.

tests_lit/assembler/arm32/sdiv.ll

+; Show that we know how to translate sdiv
+
+; NOTE: We use -O2 to get rid of memory stores.
+
+; REQUIRES: allow_dump
+
+; Compile using standalone assembler.
+; RUN: %p2i --filetype=asm -i %s --target=arm32 --args -O2 -mattr=hwdiv-arm \
+; RUN:   | FileCheck %s --check-prefix=ASM
+
+; Show bytes in assembled standalone code.
+; RUN: %p2i --filetype=asm -i %s --target=arm32 --assemble --disassemble \
+; RUN:   --args -O2 -mattr=hwdiv-arm | FileCheck %s --check-prefix=DIS
+
+; Compile using integrated assembler.
+; RUN: %p2i --filetype=iasm -i %s --target=arm32 --args -O2 -mattr=hwdiv-arm \
+; RUN:   | FileCheck %s --check-prefix=IASM
+
+; Show bytes in assembled integrated code.
+; RUN: %p2i --filetype=iasm -i %s --target=arm32 --assemble --disassemble \
+; RUN:   --args -O2 -mattr=hwdiv-arm | FileCheck %s --check-prefix=DIS
+
+define internal i32 @SdivTwoRegs(i32 %a, i32 %b) {
+  %v = sdiv i32 %a, %b
+  ret i32 %v
+}
+
+; ASM-LABEL:SdivTwoRegs:
+; ASM-NEXT:.LSdivTwoRegs$__0:
+; ASM-NEXT:     tst     r1, r1
+; ASM-NEXT:     bne     .LSdivTwoRegs$local$__0
+; ASM-NEXT:     .long 0xe7fedef0
+; ASM-NEXT:.LSdivTwoRegs$local$__0:
+; ASM-NEXT:     sdiv    r0, r0, r1
+; ASM-NEXT:     bx      lr
+
+; DIS-LABEL:00000000 <SdivTwoRegs>:
+; DIS-NEXT:   0:        e1110001
+; DIS-NEXT:   4:        1a000000
+; DIS-NEXT:   8:        e7fedef0
+; DIS-NEXT:   c:        e710f110
+; DIS-NEXT:  10:        e12fff1e
+
+; IASM-LABEL:SdivTwoRegs:
+; IASM-NEXT:.LSdivTwoRegs$__0:
+; IASM-NEXT:    tst     r1, r1
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x1a
+; IASM-NEXT:    .long 0xe7fedef0
+; IASM-NEXT:    .byte 0x10
+; IASM-NEXT:    .byte 0xf1
+; IASM-NEXT:    .byte 0x10
+; IASM-NEXT:    .byte 0xe7
+; IASM-NEXT:    .byte 0x1e
+; IASM-NEXT:    .byte 0xff
+; IASM-NEXT:    .byte 0x2f
+; IASM-NEXT:    .byte 0xe1