RFR: 8324584: Optimize Symbol and char* handling in ClassLoader [v4]

[Matias Saavedra Silva]

> The call to `ClassLoader::load_class()` currently takes a Symbol* for the name and later extracts the string only to change it back into a Symbol* inside `ClassLoader::search_module_entries()` while also recalculating the package entry. This patch simply passes the string directly along with the package entry from the caller. Verified with tier1-5 tests.

Matias Saavedra Silva has updated the pull request incrementally with one additional commit since the last revision:

  Improved comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17761/files
  - new: https://git.openjdk.org/jdk/pull/17761/files/2ffef722..252c545c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17761&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17761&range=02-03

  Stats: 5 lines in 2 files changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/17761.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17761/head:pull/17761

PR: https://git.openjdk.org/jdk/pull/17761