RFR: 8268174: Move x86-specific stub declarations into stubRoutines_x86.hpp

[Vladimir Kozlov]

On Thu, 3 Jun 2021 12:20:34 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

> A cleanup which makes x86-specific stubs platform-specific.
> 
> Testing:
> - [x] hs-tier1 - hs-tier2
> - [x] x86_32 hotspot build

src/hotspot/cpu/x86/stubRoutines_x86_64.cpp line 46:

> 44: address StubRoutines::x86::_double_sign_mask = NULL;
> 45: address StubRoutines::x86::_double_sign_flip = NULL;
> 46: address StubRoutines::x86::_method_entry_barrier = NULL;

'New line' at the end?

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PR: https://git.openjdk.java.net/jdk/pull/4335