WebAudio: Optimize calculateNormalizationScale().

WebAudio: Optimize calculateNormalizationScale().
https://bugs.webkit.org/show_bug.cgi?id=74372

Reviewed by Eric Carlson.

No new tests; optimization of existing code, so covered by existing test cases.

* platform/audio/Reverb.cpp:
(WebCore::calculateNormalizationScale): Replace implementation with optimized vector
    math operation.
(WebCore::Reverb::Reverb):
* platform/audio/VectorMath.cpp:
(WebCore::VectorMath::vsvesq): Vector math operation for squared sum of elements.
* platform/audio/VectorMath.h:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@105004 268f45cc-cd09-0410-ab3c-d52691b4dbfc