RFR: 8301743: RISC-V: Add InlineSkippedInstructionsCounter to post-call nops

[Xiaolin Zheng]

RISC-V part of [JDK-8300002](https://bugs.openjdk.org/browse/JDK-8300002), one line only.

(Did not observe performance impact on JMH mentioned in JDK-8300002.)

Tested hotspot tier1 (fastdebug).

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Commit messages:
 - JDK-8300002

Changes: https://git.openjdk.org/jdk/pull/12402/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12402&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301743
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/12402.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12402/head:pull/12402

PR: https://git.openjdk.org/jdk/pull/12402