We find test failures in gdb.dwarf2/dw2-ref-missing-frame.exp when
test cases are compiled as thumb.
https://bugs.launchpad.net/gdb-linaro/+bug/615997

In dw2-ref-missing-frame-func.c, it is assumed that address of label
'func_loopfb_start' is equal to address of function func_loopfb.
However, in thumb, the label is 16-bit aligned, while function is
32-bit aligned, so label address may not be equal to function address.

Patch below is to set labels 32-bit aligned.  Tested this patch on
both x86 and armel.  OK to apply?

-- 
Yao Qi
CodeSourcery
yao@codesourcery.com
(650) 331-3385 x739