RFR: 8139259: aarch64: jtreg test TestLogSum segvs after 8132207

[Vladimir Kozlov]

Yes, we should avoid using platform specific flags (UseSSE or UseAVX) 
directly in shared (C2, for example) code. Thank you for fixing it, Ed.

Reviewed with Roland's comment.

Vladimir

On 10/9/15 8:23 PM, Roland Westrelin wrote:
> Hi Ed,
>
>> http://cr.openjdk.java.net/~enevill/8139259/webrev/
>
> All 64 bit x86 cpus support sse2 so the new check in stubGenerator_x86_64.cpp is useless. Given in the interpreter and c1, we call the exp stub unconditionally, it didn’t really make sense that it was conditional on UseSSE in c2, anyway. Your library_call.cpp change looks good to me. I’ll sponsor it.
>
> Roland.
>