[PATCH] D150965: [HIP] Allow std::malloc in device function

[Yaxun Liu via Phabricator via cfe-commits]

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D106463 <https://reviews.llvm.org/D106463> caused a regression that prevents std::malloc to be
called in the device function, which is allowed with nvcc.

Basically the standard C++ header introducing malloc in
std namespace by `using ::malloc`. The device ::malloc
function needs to be declared before `using ::malloc`
to be introduced into std namespace.

Revert D106463 <https://reviews.llvm.org/D106463> and add a test.


https://reviews.llvm.org/D150965

Files:
  clang/lib/Headers/__clang_hip_runtime_wrapper.h
  clang/test/Headers/Inputs/include/cstdlib
  clang/test/Headers/Inputs/include/math.h
  clang/test/Headers/Inputs/include/sstream
  clang/test/Headers/Inputs/include/stdexcept
  clang/test/Headers/hip-header.hip

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