Extended Description

I have attached an arm assembly file which can demonstrate the issue.
(The test case is an excerpt from compiler-rt ARM builtins library)

$ clang -mcpu=cortex-a9 -c /tmp/temp.s -no-integrated-as -o /tmp/temp.o
/tmp/temp.s: Assembler messages:
/tmp/temp.s:13: Error: branch out of range
clang-3.5: error: assembler command failed with exit code 1 (use -v to see invocation)

$ clang -mcpu=cortex-a9 -c /tmp/temp.s -integrated-as -o /tmp/temp.o
The integrated-as compiles the file with out an issue and generates bad assembly

$ arm-none-linux-gnueabi-objdump -S /tmp/temp.o
/tmp/temp.o: file format elf32-littlearm
Disassembly of section .text:
00000000 <__sync_fetch_and_add_8>:
0: b570 push {r4, r5, r6, lr}
2: f3bf 8f5f dmb sy
6: 4684 mov ip, r0
8: e8dc 017f ldrexd r0, r1, [ip]
c: 1884 adds r4, r0, r2
e: eb41 0503 adc.w r5, r1, r3
12: e8cc 4576 strexd r6, r4, r5, [ip]
16: bbbe cbnz r6, 88 <__sync_fetch_and_add_8+0x88>
18: f3bf 8f5f dmb sy
1c: bd70 pop {r4, r5, r6, pc}

There is no address corresponding to 88 <__sync_fetch_and_add_8+0x88>.

The ARM manual on CBNZ says backward branching is not possible.
Refer to http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0489c/Cjaghefc.html