JDK-8304539: Cleanup utilities/{count_leading_zeros,count_trailing_zeros,population_count}.hpp

[jcking]

As the title says, cleanup the mentioned headers. This is similar to byteswap.hpp and removes the extraneous #ifdef for XLC since it is really just Clang now.

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Progress

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Issue

• JDK-8304539: Cleanup utilities/{count_leading_zeros,count_trailing_zeros,population_count}.hpp

Reviewing

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/reviewers 2

[openjdk]

@jcking
The total number of required reviews for this PR (including the jcheck configuration and the last /reviewers command) is now set to 2 (with at least 1 Reviewer, 1 Author).

[mlbridge]

Webrevs

• 12: Full - Incremental (e52ce442)
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• 10: Full - Incremental (167781b9)
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