[MLIR][SPIRVToLLVM] Conversion of GLSL ops to LLVM intrinsics

This patch introduces new intrinsics in LLVM dialect:
-  `llvm.intr.floor`
-  `llvm.intr.maxnum`
-  `llvm.intr.minnum`
-  `llvm.intr.smax`
-  `llvm.intr.smin`
These intrinsics correspond to SPIR-V ops from GLSL
extended instruction set (`spv.GLSL.Floor`, `spv.GLSL.FMax`,
`spv.GLSL.FMin`,  `spv.GLSL.SMax` and `spv.GLSL.SMin`
respectively). Also conversion patterns for them were added.

Reviewed By: antiagainst

Differential Revision: https://reviews.llvm.org/D84661