[HLSL][DXIL][SPIRV] QuadReadAcrossX intrinsic support (#184360)

This PR adds QuadReadAcrossX intrinsic support in HLSL with codegen for
both DirectX and SPIRV backends. Resolves
https://github.com/llvm/llvm-project/issues/99175.

- [x] Implement QuadReadAcrossX clang builtin
- [x]  Link QuadReadAcrossX clang builtin with hlsl_intrinsics.h
- [x] Add sema checks for QuadReadAcrossX to
CheckHLSLBuiltinFunctionCall in SemaChecking.cpp
- [x] Add codegen for QuadReadAcrossX to EmitHLSLBuiltinExpr in
CGBuiltin.cpp
- [x] Add codegen tests to
clang/test/CodeGenHLSL/builtins/QuadReadAcrossX.hlsl
- [x] Add sema tests to
clang/test/SemaHLSL/BuiltIns/QuadReadAcrossX-errors.hlsl
- [x] Create the int_dx_QuadReadAcrossX intrinsic in
IntrinsicsDirectX.td
- [x] Create the DXILOpMapping of int_dx_QuadReadAcrossX to 123 in
DXIL.td
- [x] Create the QuadReadAcrossX.ll and QuadReadAcrossX_errors.ll tests
in llvm/test/CodeGen/DirectX/
- [x] Create the int_spv_QuadReadAcrossX intrinsic in IntrinsicsSPIRV.td
- [x] In SPIRVInstructionSelector.cpp create the QuadReadAcrossX
lowering and map it to int_spv_QuadReadAcrossX in
SPIRVInstructionSelector::selectIntrinsic.
- [x] Create SPIR-V backend test case in
llvm/test/CodeGen/SPIRV/hlsl-intrinsics/QuadReadAcrossX.ll