[PATCH] D142606: Lazyly initialize uncommon toolchain detector

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Cuda and rocm toolchain detectors are currently run unconditionally, while their result may not be used at all. Make their initialization lazy so that the discovery code is not run in common cases.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D142606

Files:
  clang/lib/Driver/ToolChains/AMDGPU.cpp
  clang/lib/Driver/ToolChains/AMDGPUOpenMP.cpp
  clang/lib/Driver/ToolChains/FreeBSD.cpp
  clang/lib/Driver/ToolChains/Gnu.cpp
  clang/lib/Driver/ToolChains/Gnu.h
  clang/lib/Driver/ToolChains/HIPAMD.cpp
  clang/lib/Driver/ToolChains/LazyDetector.h
  clang/lib/Driver/ToolChains/Linux.cpp

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