RFR: 8261268: LOAD_INSTANCE placeholders unneeded for parallelCapable class loaders [v2]

[Coleen Phillimore]

> See CR for more details.  This optimizes some code for class loading.
> Tested with tier1-6.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Fix some comment

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2469/files
  - new: https://git.openjdk.java.net/jdk/pull/2469/files/9eb1634b..c28d8ded

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2469&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2469&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2469.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2469/head:pull/2469

PR: https://git.openjdk.java.net/jdk/pull/2469