RFR: 8248188: Add IntrinsicCandidate and API for Base64 decoding [v7]

[CoreyAshford]

On Wed, 21 Oct 2020 13:42:48 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

> Buried in that GitHub test run link are the results for
> windows-x64-debug_testlogs_hs_tier1_compiler
> which includes this file (test-summary.txt):
> 
> ```
> ==============================
> Test summary
> ==============================
>    TEST                                              TOTAL  PASS  FAIL ERROR   
> >> jtreg:test/hotspot/jtreg:tier1_compiler             742   683    59     0 <<
> ==============================
> TEST FAILURE
> ```
> 
> I poked around, but I don't see any logs for the individual
> test failures.

In a browser at the provide test link, on the upper right in the "three-dot menu", there's an option to download the logs.  The only file containing failures is `6_Windows x64 (hstier1 compiler).txt`. There are quite a few exception backtraces in this log file, but they all look similar, saying:
TEST RESULT: Failed. Execution failed: `main' threw exception: java.lang.NullPointerException: Cannot invoke "java.lang.Throwable.getCause()" because "<local1>" is null
There's only one that's slightly different:
TEST RESULT: Failed. Execution failed: `main' threw exception: java.lang.Error: Can't get full path name for '.', got exception java.lang.NullPointerException: Cannot invoke "java.lang.Throwable.getCause()" because "<local1>" is null

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PR: https://git.openjdk.java.net/jdk/pull/293