RFR: 8290706: Remove the support for inline contiguous allocations [v2]

[Aleksey Shipilev]

> 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.

Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - Merge branch 'master' into JDK-8290706-remove-inline-contig
 - Work

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Changes: https://git.openjdk.org/jdk/pull/9576/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9576&range=01
  Stats: 1007 lines in 45 files changed: 3 ins; 961 del; 43 mod
  Patch: https://git.openjdk.org/jdk/pull/9576.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9576/head:pull/9576

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