RFR: 8291895: Remove PRAGMA_NONNULL_IGNORED from x86 and AArch64 [v2]

[Andrew Haley]

> I fixed the underlying bugs, so the warnings are now superfluous. Build on GCC 11.0.3 and GCC head.

Andrew Haley has updated the pull request incrementally with one additional commit since the last revision:

  8291895: Remove PRAGMA_NONNULL_IGNORED from x86 and AArch64

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9742/files
  - new: https://git.openjdk.org/jdk/pull/9742/files/5c19e516..504badba

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9742&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9742&range=00-01

  Stats: 7 lines in 6 files changed: 0 ins; 7 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/9742.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9742/head:pull/9742

PR: https://git.openjdk.org/jdk/pull/9742