RFR: 8337654: Relocate uncommon trap stub from SharedRuntime to OptoRuntime [v3]

[Andrew Dinn]

> Reorganization of generation and management code for C2-specific blob so that it is, as far as possible, under the scope of class OptoRuntime with an implementation located in C2-specific source files.

Andrew Dinn has updated the pull request incrementally with one additional commit since the last revision:

  add new riscv source

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20417/files
  - new: https://git.openjdk.org/jdk/pull/20417/files/eb9b2d5c..7d7b3288

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20417&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20417&range=01-02

  Stats: 382 lines in 1 file changed: 382 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20417.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20417/head:pull/20417

PR: https://git.openjdk.org/jdk/pull/20417