Revert "Support constant folding of trigonometry built-ins" Part of a chain breaking the clang build: http://build.chromium.org/p/chromium.gpu.fyi/builders/GPU%20Linux%20Builder/builds/33588 This reverts commit af930db15010cacfcdc74bee630372b8f6eb3eeb. Change-Id: Ic0bf09b4088a1ee285fed0fbd77dfc4c682fcd12 Reviewed-on: https://chromium-review.googlesource.com/265144 Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org>