[15] RFR (S): 8241597: x86: Remove MMX support

[Vladimir Ivanov]

Forgot to include bug id in the subject. Fixed.

Best regards,
Vladimir Ivanov

On 25.03.2020 17:00, Vladimir Ivanov wrote:
> http://cr.openjdk.java.net/~vlivanov/8241597/webrev.00/
> https://bugs.openjdk.java.net/browse/JDK-8241597
> 
> MMX is not used in x86-64 code.
> 
> Instead of making relevant code 32-bit only, I propose to remove all 
> usages from both x86-64 and x86-32 specific code. (The only piece left 
> is Assembler::emms() which is used in MacroAssembler::empty_FPU_stack().)
> 
> Also, got rid of VM_Version::supports_mmx_ext() along the way.
> 
> Testing: hs-tier1,hs-tier2, successfully built x86-32 (just a build, no 
> additional testing performed)
> 
> Thanks!
> 
> Best regards,
> Vladimir Ivanov