RFR: 8290706: Remove the support for inline contiguous allocations

[Boris Ulasevich]

On Wed, 20 Jul 2022 17:39:28 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> See the bug for rationale and link to RFC.
> 
> This removes the 3rd allocation path (first two being TLAB and native GC interface), that is used by Serial/Parallel when TLABs are not available. There is little sense in keeping this code, especially since it requires supporting a bunch of platform-specific assembly.
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug `tier1`
>  - [x] Linux x86_32 fastdebug `tier1`
>  - [x] Linux x86_64 Zero build
>  - [x] Linux AArch64 cross-build (attn @theRealAph, @adinn)
>  - [x] Linux ARM cross-build (attn @bulasevich, @snazarkin)
>  - [x] Linux S390X cross-build (attn @backwaterred, @RealLucy)
>  - [x] Linux PPC64 cross-build (attn @TheRealMDoerr, @reinrich)
>  - [x] Linux RISC-V cross-build (attn @RealFYang)
> 
> Apart from x86, I only verified the cross-compilation builds pass, no other testing is done.
> 
> I did not touch the JVMCI interfaces, since I am not sure what is the proper protocol for JVMCI changes.

:hotspot and :tier1 is OK on ARM32

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PR: https://git.openjdk.org/jdk/pull/9576