RFR: 8263632: Improve exception handling of APIs in classLoader.cpp

[Calvin Cheung]

Please review this change which includes:

-  adding `ClassLoader::create_class_path_entry_or_fail()` and `ClassLoader::create_class_path_entry_or_fail()` functions for better readability. They will call the existing `ClassLoader::create_class_path_entry()`.
- replacing the TRAPS parameter with `Thread* current` for the functions which never throw exception.

Testing: tiers 1,2 (passed); tiers 3,4 (in progress).

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Commit messages:
 - 8263632: Improve exception handling of APIs in classLoader.cpp

Changes: https://git.openjdk.java.net/jdk/pull/3203/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3203&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263632
  Stats: 54 lines in 6 files changed: 24 ins; 6 del; 24 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3203.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3203/head:pull/3203

PR: https://git.openjdk.java.net/jdk/pull/3203