RFR(L): Remove global safepoint code

[Robbin Ehn]

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
>