[llvm-dev] https://reviews.llvm.org/D41659 Needs review.

[ADIL ARUN DANGUI via llvm-dev]

https://reviews.llvm.org/D41659

Implemented missing trigonometric optimization in llvm.

Here we have implemented the following missing trigonometric optimizations.

   1. tan(x)*cos(x)=sin(x)
   2. sin(x)*cos(x) = sin(2*x)/2
   3. sin(x)/tan(x)=cos(x);
   4. tan(x)/sin(x)=1/cos(x);
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