[clang] AMDGPU: Find device files even when ROCM_PATH is set (PR #177346)

[Matt Arsenault via cfe-commits]

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@@ -207,16 +211,15 @@ RocmInstallationDetector::getInstallationPathCandidates() {
 
   // For candidate specified by --rocm-path we do not do strict check, i.e.,
   // checking existence of HIP version file and device library files.
+  // These are added first as highest priority candidates, but we continue
+  // to add clang-relative paths to support cases where the compiler has its
+  // own device libraries (e.g., python wheels with bundled device libs).
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arsenm wrote:

I have all the enthusiasm to move this code. The current system is unworkable, it takes a year to make any cross component change 

https://github.com/llvm/llvm-project/pull/177346