fix(clr): Use rocr backend for HIP/OCL by default

[agunashe]

Motivation

Use rocr by default to see if we pass all tests

Technical Details

Use rocr by default to see if we pass all tests

Issue Tracking

JIRA ID: ROCM-20431

Test Plan

hip-tests with GPU_ENABLE_PAL=0 passing and all component tests on Rock pass

Test Result

hip-tests with GPU_ENABLE_PAL=0 passing and all component tests on Rock pass

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/rocm-systems/blob/develop/CONTRIBUTING.md.

[therock-pr-bot]

❌ PR Check — Action Required

Check	Status	Details
🌿 Branch Name	✅ Pass	—
📝 PR Title/Description	✅ Pass	—
⛔ Forbidden Files	✅ Pass	—
🧪 Unit Test	❌ Fail	Error: Source/code files changed without an accompanying unit test. Expected: add at least one test file named like test_<name>.py / test_<name>.cpp (or <name>_test.*). Current: code file(s) changed: projects/clr/rocclr/device/device.cpp, projects/clr/rocclr/utils/flags.hpp, projects/hip-tests/catch/unit/env/hipEnvGpuEnablePal.cc; no test file found
🔎 pre-commit	⏳ Pending	⏳ Still running…
🚫 Draft PR	🔜 To Be Enabled	—
🚩 Feature Flag	🔜 To Be Enabled	—
📊 Code Coverage	🔜 To Be Enabled	—

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• ❌ Unit Test

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[therock-pr-bot]

🚫 Please fix the failed policies before requesting reviews.

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• ❌ Unit Test

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[Copilot]

Pull request overview

This PR changes ROCclr’s default backend selection so HIP/OCL prefer the ROCr backend (including on Windows), primarily to evaluate overall test pass rate under ROCr-by-default behavior.

Changes:

• Set the default GPU_ENABLE_PAL flag value to prefer ROCr.
• Update Windows-specific backend defaulting logic in Device::init() to choose ROCr when the flag is untouched.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
projects/clr/rocclr/utils/flags.hpp	Changes the default value of GPU_ENABLE_PAL, affecting which backend is selected when users don’t set the flag.
projects/clr/rocclr/device/device.cpp	Updates Windows defaulting logic so the ROCr backend is selected by default.

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