ARM: Fix inline assembly (r21949) for Clang.

ARM: Fix inline assembly (r21949) for Clang.

Add a 'c' predicate to the immediate syscall number. This tells the
compiler to omit the leading '#' that immediates usually have in ARM.
The GNU assembler tolerates "ldr r7, =#1234" but Clang does not.

BUG=V8:3403
LOG=N
R=bmeurer@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=21963

[jbramley, 2014-06-24 11:05:56]

I don't have a cross-compilation environment working for V8 with Clang, but this
works in isolation. I'm using Clang 3.5-1ubuntu1.

[Benedikt Meurer, 2014-06-24 11:23:47]

LGTM

[jbramley, 2014-06-24 11:26:56]

Committed patchset #1 manually as r21963 (presubmit successful).