Add new form of ldr/str (immediate) to ARM integrated assembler.

tests_lit/assembler/arm32/global-load-store.ll

Index: tests_lit/assembler/arm32/global-load-store.ll
diff --git a/tests_lit/assembler/arm32/global-load-store.ll b/tests_lit/assembler/arm32/global-load-store.ll
index d5c1edfdcc0669f30bbc71f23d91e93126f7fcf3..bfd8fe478909f843874c00f33864e220d51d25ae 100644
--- a/tests_lit/assembler/arm32/global-load-store.ll
+++ b/tests_lit/assembler/arm32/global-load-store.ll
@@ -55,7 +55,10 @@ define internal i32 @load() {
 ; IASM-NEXT: .Lload$__0:
 ; IASM-NEXT:    movw    r0, #:lower16:global1
 ; IASM-NEXT:    movt    r0, #:upper16:global1
-; IASM-NEXT:    ldr     r0, [r0]
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x90
+; IASM-NEXT:    .byte 0xe5
 ; IASM-NEXT:    .byte 0x1e
 ; IASM-NEXT:    .byte 0xff
 ; IASM-NEXT:    .byte 0x2f
@@ -84,7 +87,10 @@ define internal void @store(i32 %v) {
 ; IASM-NEXT: .Lstore$__0:
 ; IASM-NEXT:    movw    r1, #:lower16:global1
 ; IASM-NEXT:    movt    r1, #:upper16:global1
-; IASM-NEXT:    str     r0, [r1]
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x81
+; IASM-NEXT:    .byte 0xe5
 ; IASM-NEXT:    .byte 0x1e
 ; IASM-NEXT:    .byte 0xff
 ; IASM-NEXT:    .byte 0x2f