RFR: 8335110: Fix instruction name and API spec inconsistencies in CodeBuilder [v2]

[Chen Liang]

> This is a collection of fixes and improvements to CodeBuilder, plus 2 renames.
> 
> Fixes include:
> 1. `CodeBuilder::receiverSlot` typo
> 2. `CodeAttribute::labelToBci` update spec
> 3. `CodeBuilder::exceptionCatch` implementation
> 4. `CodeBuilder::if_nonnull`/`if_null` -> `ifnonnull`/`ifnull`
> 5. Docs for what instructions factories emit, and to explain why some factories have name mismatch; also a section in summary.

Chen Liang has updated the pull request incrementally with one additional commit since the last revision:

  Patch in csr but forgot to upload

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/19889/files
  - new: https://git.openjdk.org/jdk/pull/19889/files/013a5cf2..8fe07e1c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19889&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19889&range=00-01

  Stats: 15 lines in 1 file changed: 0 ins; 1 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/19889.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19889/head:pull/19889

PR: https://git.openjdk.org/jdk/pull/19889