[clang][OpenMP] Add OpenMP GPU optimization flag framework (#178914) This patch series adds a framework of OpenMP GPU optimization flags to enable more efficient code generation for GPU offloading. The series consists of three patches: 1. Add negative flag variants (-fno-*) for existing assume options to allow explicit disabling of optimizations. 2. Add -fopenmp-target-ignore-env-vars flag to indicate that OpenMP runtime can ignore environment variables during code generation, enabling optimizations like skipping runtime checks and eliminating conditional branches. 3. Add -fopenmp-target-fast meta-flag that implies the above optimization flags. This convenience flag is automatically enabled by -Ofast and provides a simple interface for aggressive GPU optimizations. The flags benefit all GPU targets (NVPTX, AMDGPU, Intel GPU) by providing a standard way to enable common GPU optimization patterns. Individual flags can be selectively overridden while keeping others enabled.
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