Add hybrid assembler concept to ARM assembler.

tests_lit/assembler/arm32/add.ll

 ; Show that we know how to translate add.
 
 ; 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
+
 define internal i32 @add1ToR0(i32 %p) {
   %v = add i32 %p, 1
   ret i32 %v
 }
 
 ; ASM-LABEL: add1ToR0:
 ; ASM:       add     r0, r0, #1
 ; ASM-NEXT:  bx      lr
 
+; DIS-LABEL:00000000 <add1ToR0>:
+; DIS-NEXT:   0:        e2800001
+; DIS-NEXT:   4:        e12fff1e
+
 ; IASM-LABEL: add1ToR0:
-; IASM:      .byte 0x1
-; IASM-NEXT: .byte 0x0
-; IASM-NEXT: .byte 0x80
-; IASM-NEXT: .byte 0xe2
+
+; IASM-NEXT:    .byte 0x1
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x80
+; IASM-NEXT:    .byte 0xe2
+
+; IASM-NEXT:    .byte 0x1e
+; IASM-NEXT:    .byte 0xff
+; IASM-NEXT:    .byte 0x2f
+; IASM-NEXT:    .byte 0xe1
 
 define internal i32 @Add2Regs(i32 %p1, i32 %p2) {
   %v = add i32 %p1, %p2
   ret i32 %v
 }
 
 ; ASM-LABEL: Add2Regs:
 ; ASM:       add r0, r0, r1
 ; ASM-NEXT:  bx lr
 
+; DIS-LABEL:00000010 <Add2Regs>:
+; DIS-NEXT:  10:        e0800001
+; DIS-NEXT:  14:        e12fff1e
+
 ; IASM-LABEL: Add2Regs:
 
-; IASM:      .byte 0x1
-; IASM-NEXT: .byte 0x0
-; IASM-NEXT: .byte 0x80
-; IASM-NEXT: .byte 0xe0
+; IASM-NEXT:    .byte 0x1
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x80
+; IASM-NEXT:    .byte 0xe0
+
+; IASM-NEXT:    .byte 0x1e
+; IASM-NEXT:    .byte 0xff
+; IASM-NEXT:    .byte 0x2f
+; IASM-NEXT:    .byte 0xe1