RFR: 8286891: thread_local causes undefined symbol error with XL C

[Martin Doerr]

On Tue, 17 May 2022 15:56:28 GMT, Tyler Steele <tsteele at openjdk.org> wrote:

> When using XLClang++ to compile a `thread_local` struct with a destructor, a compiler bug is exposed that results in a missing constructor and a linker error.
> 
> Adding the missing constructor solves this issue.
> CHnges
> - Builds on AIX (previously broken)

`#` should usually be at the beginning of the line. Please also add a comment why this is needed.

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PR: https://git.openjdk.java.net/jdk/pull/8754