RFR: 8256052: Remove unused allocation type from fieldInfo

[Frederic Parain]

Please review this small cleanup code, removing the now unused allocation type from the fieldInfo structure.

Tested with Mach5, tiers 1 to 3 and locally by running test/hotspot/jtreg/serviceability/sa tests.

Thank you,

Fred

-------------

Commit messages:
 - Cleanup fieldInfo structure

Changes: https://git.openjdk.java.net/jdk/pull/1130/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1130&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256052
  Stats: 121 lines in 5 files changed: 6 ins; 98 del; 17 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1130.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1130/head:pull/1130

PR: https://git.openjdk.java.net/jdk/pull/1130