[X86][NFC] Added/Updated SINCOS function testcases (llvm#141283)

- Moved vector testcases test_sincos_v4f32 and test_sincos_v2f64
  from llvm/test/CodeGen/X86/llvm.sincos.ll
  to llvm/test/CodeGen/X86/llvm.sincos.vec.ll. And added nounwind too.
- Added sincos testcases for float, double and x86_fp80 types in
  llvm/test/CodeGen/X86/llvm.sincos.ll

Author: JaydeepChauhan14