Add VADD instruction to the ARM integrated assembler.

tests_lit/assembler/arm32/vadd.ll

-; Show that we know how to translate rbit.
+; Show that we know how to translate vadd.
 
 ; 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 \
 ; 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 | FileCheck %s --check-prefix=DIS
 
 ; Compile using integrated assembler.
 ; RUN: %p2i --filetype=iasm -i %s --target=arm32 --args -O2 \
 ; 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 | FileCheck %s --check-prefix=DIS
 
-declare i32 @llvm.cttz.i32(i32, i1)
-
-define internal i32 @testRbit(i32 %a) {
-; ASM-LABEL: testRbit:
-; DIS-LABEL: 00000000 <testRbit>:
-; IASM-LABEL: testRbit:
+define internal float @testVadd(float %v1, float %v2) {
+; ASM-LABEL: testVadd:
+; DIS-LABEL: 00000000 <testVadd>:
+; IASM-LABEL: testVadd:
 
 entry:
-; ASM-NEXT: .LtestRbit$entry:
-; IASM-NEXT: .LtestRbit$entry:
+; ASM-NEXT: .LtestVadd$entry:
+; IASM-NEXT: .LtestVadd$entry:
 
-  %x = call i32 @llvm.cttz.i32(i32 %a, i1 0)
+  %res = fadd float %v1, %v2
 
-; ASM-NEXT:     rbit    r0, r0
-; DIS-NEXT:    0:       e6ff0f30
+; ASM-NEXT:     vadd.f32        s0, s0, s1
+; DIS-NEXT:    0:       ee300a20
+; IASM-NEXT:    .byte 0x20
+; IASM-NEXT:    .byte 0xa
 ; IASM-NEXT:    .byte 0x30
-; IASM-NEXT:    .byte 0xf
-; IASM-NEXT:    .byte 0xff
-; IASM-NEXT:    .byte 0xe6
+; IASM-NEXT:    .byte 0xee
 
-  ret i32 %x
+  ret float %res
 }