RFR: JDK-8302102: Disable ASan for SafeFetch and os::print_hex_dump

[Justin King]

Disable ASan instrumentation for non-assembly versions of SafeFetch and os::print_hex_dump.

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Commit messages:
 - Disable ASan for SafeFetch and os::print_hex_dump

Changes: https://git.openjdk.org/jdk/pull/12477/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12477&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302102
  Stats: 40 lines in 4 files changed: 32 ins; 5 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/12477.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12477/head:pull/12477

PR: https://git.openjdk.org/jdk/pull/12477