RFR: 8286397: Address possibly lossy conversions in jdk.hotspot.agent [v3]

[Ryan Ernst]

> Applied required casts in jdk.hotspot.agent for the upcoming warning.
> Verified by cherry-picking @asotona's patch.

Ryan Ernst has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - Merge branch 'master' into implicit_casts_jdk.hotspot.agent
 - change long to int for primitive types in ObjectHeap
 - Merge branch 'master' into implicit_casts_jdk.hotspot.agent
 - 8286397: Address possibly lossy conversions in jdk.hotspot.agent
   
   Applied required casts in jdk.hotspot.agent for the upcoming warning.
   Verified by cherry-picking @asotona's patch.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/9280/files
  - new: https://git.openjdk.org/jdk/pull/9280/files/fb74a60f..2ce155bb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9280&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9280&range=01-02

  Stats: 1043 lines in 87 files changed: 147 ins; 571 del; 325 mod
  Patch: https://git.openjdk.org/jdk/pull/9280.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9280/head:pull/9280

PR: https://git.openjdk.org/jdk/pull/9280