[clang] clang: Fix hipstdpar test relying on default target (PR #111975)

[Shilei Tian via cfe-commits]

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@@ -1,21 +1,17 @@
-// REQUIRES: x86-registered-target
-// REQUIRES: amdgpu-registered-target
-// REQUIRES: system-linux
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shiltian wrote:

I'm not sure if the removal of `system-linux` would cause issue.

https://github.com/llvm/llvm-project/pull/111975