RFR(S) fix assert in CodeInstaller::pd_next_offset() on x86

[Tom Rodriguez]

Thanks.  I’ll push this along with your other recent fixes.

tom

On Dec 18, 2014, at 6:56 PM, Vladimir Kozlov <vladimir.kozlov at oracle.com> wrote:

> http://cr.openjdk.java.net/~kvn/graal_x86_assert_fix/webrev/
> 
> According to Intel's manual in 64-bit mode call instructions don't need REX prefix. Only REX_B can be added for extended registers.
> 
> Thanks,
> Vladimir