Add clobber list to arm inline asm.

Add clobber list to arm inline asm.

While enabling "-fstack-protector", compiler generates code in
function prologue and epilogue to do stack check. However, without
knowing that 'r1', 'r2' and 'r3' is used/destroyed in inline asm,
compiler assumes that 'r1', 'r2', or 'r3' can be used exclusively,
which leads to a core dump.

Fix to this is quite straightforward, just add clobber list to the
inlineasm.

BUG=None
TEST=manually checked the generated asm code,boot up chrome browser successfully with this modification

Committed: https://code.google.com/p/v8/source/detail?r=10977

[Han Shen, 2012-03-08 18:23:38]

Hi Søren and Kevin, could you take a look at this CL? It is related to enable
hardened arm build. Thanks, -Han

[Søren Gjesse, 2012-03-08 20:34:17]

Forwarding to Yang Guo.

[Yang, 2012-03-09 10:20:29]

On 2012/03/08 20:34:17, Søren Gjesse wrote:
> Forwarding to Yang Guo.

LGTM and landing.