[jdk11u-dev] RFR: 8261075: Create stubRoutines.inline.hpp with SafeFetch implementation

[Vladimir Kempik]

Please review this backport of 8261075 to jdk11u-dev.
Not applying cleanly mostly due to some context code difference and miss of zgc.
It's just code location refactoring, no actual code changed.
It's a prerequest for mac-aarch64 jep backport.
This will soon be followed by backport of 8263068.

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Commit messages:
 - 8261075: Create stubRoutines.inline.hpp with SafeFetch implementation

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/532/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=532&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261075
  Stats: 88 lines in 10 files changed: 58 ins; 26 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/532.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/532/head:pull/532

PR: https://git.openjdk.java.net/jdk11u-dev/pull/532