[Issue 16513] Speed up TemplateInstance.findExistingInstance hash

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16513

--- Comment #8 from github-bugzilla at puremagic.com ---
Commits pushed to stable at https://github.com/dlang/dmd

https://github.com/dlang/dmd/commit/d41992ee9c9ce96c0dc0df97b5a63ff7f8be077f
use non-associative op to combine hashes

https://github.com/dlang/dmd/commit/b69e2edc9564850573f046a4206bbea9ff61e23b
Merge pull request #6418 from MartinNowak/fix16513

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