[Bug middle-end/122082] complex multiply: w * conj(w) should have zero imaginary part

[tydeman at tybor dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122082

--- Comment #7 from Fred J. Tydeman <tydeman at tybor dot com> ---
I see two statements in comment #2.  I do not see any questions there.
In comment #1, I do see a question.  I am testing that the imaginary part is 0,
which is the correct result.

Another reference implementation can be found in:
https://www.open-std.org/jtc1/sc22/wg14/www/docs/n1399.htm