[jdk11u-dev] RFR: 8222825: ARM32 SIGILL issue on single core CPU (not supported PLDW instruction) [v2]

[Boris Ulasevich]

> This is the request to backport the fix to jdk11u.
> The change fixes SIGILL on ARM machines without the Multiprocessing Extensions and brings no risk for other platforms.
> 
> The original patch [1] has minor conflicts with os::is_MP [2] and AArch64 Port [3] removal updates.
>  [1] https://github.com/openjdk/jdk/commit/989fa190
> [2] https://github.com/openjdk/jdk/commit/a3cd6a1a
> [3] https://github.com/openjdk/jdk/commit/05027c12
> 
> The jtreg tests are Ok.

Boris Ulasevich has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  8222825: ARM32 SIGILL issue on single core CPU (not supported PLDW instruction)
  Reviewed-by: dholmes, dlong
  
  Backport-of: 989fa190a601654d203b8af533de9e3b81bb317e

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Changes:
  - all: https://git.openjdk.java.net/jdk11u-dev/pull/652/files
  - new: https://git.openjdk.java.net/jdk11u-dev/pull/652/files/d878d447..b4136fb3

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=652&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=652&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/652.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/652/head:pull/652

PR: https://git.openjdk.java.net/jdk11u-dev/pull/652