RFR(L): Remove global safepoint code

[Robbin Ehn]

Hi Erik,

On 2020-03-20 12:13, Erik Österlund wrote:
> Hi Robbin,
> 
> I see. Maybe we can call it fetch_and_read_polling_page() instead.
> Don't need another webrev for that if you agree; ship it!

I'll change!

Thanks, Robbin

> 
> Thanks,
> /Erik
> 
> On 2020-03-20 12:10, Robbin Ehn wrote:
>> Hi Erik,
>>
>> There was two read_polling_page:
>>
>> address read_polling_page(Register r, address page, 
>> relocInfo::relocType rtype);
>> address read_polling_page(Register r, relocInfo::relocType rtype);
>>
>> The first one took the global polling page as argument.
>> Since we no longer have that argument, to separate the methods I add 
>> get_ to the one that both gets and reads the thread polling page.
>> While the other one just reads the polling page from the address in 
>> the register is still called just read_.
>>
>> Understandable?
>>
>> On 2020-03-20 11:58, Erik Österlund wrote:
>>> Hi Robbin,
>>>
>>> Was there any particular reason for changing the name of 
>>> read_polling_page() on AArch64 to get_read_polling_page()?
>>> It now sounds like tautology.
>>>
>>> Otherwise this looks good, and I really like all the red lines. Dead 
>>> code is the best code.
>>
>> Great, thanks!
>>
>> /Robbin
>>
>>>
>>> Thanks,
>>> /Erik
>>>
>>> On 2020-03-19 13:44, Robbin Ehn wrote:
>>>> Hi all, please build, test and review.
>>>>
>>>> We removed (obsoleted) the flag ThreadLocalHandshakes in JDK 14.
>>>> Any platform defining THREAD_LOCAL_POLL can only use per thread poll.
>>>> Since all platforms now define THREAD_LOCAL_POLL the global poll 
>>>> code is dead.
>>>> Let's remove it!
>>>>
>>>> Issue: https://bugs.openjdk.java.net/browse/JDK-8220051
>>>> Changeset: 
>>>> http://cr.openjdk.java.net/~rehn/8220051/v1/webrev/index.html
>>>>
>>>> I have built fastdebug:
>>>> linux-aarch64
>>>> linux-arm32
>>>> linux-ppc64le
>>>> linux-s390x
>>>> linux-x86_64-zero
>>>> linux-x86_64 (no PCH)
>>>> linux-x86_64 (slowdebug) (no PCH)
>>>> linux-x86
>>>> osx-x86_64
>>>> windows-x86_64
>>>> solaris-sparcv9
>>>>
>>>> Tested t1-5:
>>>> linux-x86_64
>>>> osx-x86_64
>>>> windows-x86_64
>>>> solaris-sparcv9
>>>>
>>>> Manually:
>>>> linux-aarch64
>>>> linux-x86_64-zero
>>>>
>>>> Any extra help building and testing is appreciated, especially on 
>>>> arm32, ppc64le, s390x.
>>>>
>>>> Thanks, Robbin
>>>
>