[HLSL][DXIL] Implement `refract` intrinsic (#147342)

- [x] Implement refract using HLSL source in hlsl_intrinsics.h
- [x] Implement the refract SPIR-V target built-in in
clang/include/clang/Basic/BuiltinsSPIRV.td
- [x] Add sema checks for refract to CheckSPIRVBuiltinFunctionCall in
clang/lib/Sema/SemaSPIRV.cpp
- [x] Add codegen for spv refract to EmitSPIRVBuiltinExpr in
CGBuiltin.cpp
- [x] Add codegen tests to clang/test/CodeGenHLSL/builtins/refract.hlsl
- [x] Add spv codegen test to clang/test/CodeGenSPIRV/Builtins/refract.c
- [x] Add sema tests to clang/test/SemaHLSL/BuiltIns/refract-errors.hlsl
- [x] Add spv sema tests to
clang/test/SemaSPIRV/BuiltIns/refract-errors.c
- [x] Create the int_spv_refract intrinsic in IntrinsicsSPIRV.td
- [x] In SPIRVInstructionSelector.cpp create the refract lowering and
map it to int_spv_refract in SPIRVInstructionSelector::selectIntrinsic.
- [x] Create SPIR-V backend test case in
llvm/test/CodeGen/SPIRV/hlsl-intrinsics/refract.ll
- [x] Check for what OpenCL support is needed.

Resolves https://github.com/llvm/llvm-project/issues/99153

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