RFR: 8263632: Improve exception handling of APIs in classLoader.cpp [v3]

[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).

Calvin Cheung has updated the pull request incrementally with one additional commit since the last revision:

  @coleenp review comment

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3203/files
  - new: https://git.openjdk.java.net/jdk/pull/3203/files/c2d1cde7..9bf7c0b0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3203&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3203&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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