RFR: JDK-8267930: Refine code for loading hsdis library [v4]

[Hamlin Li]

> code for loading hsdis library is redundant, this is to simplify it.

Hamlin Li has updated the pull request incrementally with two additional commits since the last revision:

 - use jio_snprintf instead of strcpy and strcat
 - use jio_snprintf instead of strcpy and strcat

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4260/files
  - new: https://git.openjdk.java.net/jdk/pull/4260/files/84ff400a..e45fea69

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4260&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4260&range=02-03

  Stats: 5 lines in 2 files changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4260.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4260/head:pull/4260

PR: https://git.openjdk.java.net/jdk/pull/4260