[Regression Test][rocPRIM] Implemented Regression Test filter for emu…

…lation work (#642)

* implemented regression test filter and option

* updated changelog

* clarified some points in changelog

CHANGELOG.md

@@ -6,16 +6,15 @@ Full documentation for rocPRIM is available at [https://rocm.docs.amd.com/projec
 ## (Unreleased) rocPRIM 3.4.0 for ROCm 6.4.0
 
 ### Added
-
+* Added regression tests to `rtest.py`. Regression tests are a subset of tests that caused hardware problems for past emulation environments.
+  * Can be run with `python rtest.py [--emulation|-e|--test|-t]=regression`
 * Added the parallel `find_first_of` device function with autotuned configurations, this function is similar to `std::find_first_of`, it searches for the first occurrence of any of the provided elements.
 * Added `--emulation` option added for `rtest.py`
-* Unit tests can be ran with `[--emulation|-e|--test|-t]=<test_name>`
+  * Unit tests can be run with `[--emulation|-e|--test|-t]=<test_name>`
 
 ### Changed
-  * Modified smoke tests to complete in faster run-time and to never exceed 2GB of vram usage
-  * Old smoke tests can be ran with python3 rtest.py --test/-t smoke_old or python3 rtest.py --emulation/-e smoke_old instead
-  * `--test|-t` no longer a required flag for `rtest.py`, instead user can use either `--emulation|-e` or `--test|-t` but not both
-
+* Changed the subset of tests that are run for smoke tests such that the smoke test will complete with faster run-time and to never exceed 2GB of vram usage. Use `python rtest.py [--emulation|-e|--test|-t]=smoke` to run these tests.
+* The `rtest.py` options have changed. `rtest.py` is now run with at least either `--test|-t` or `--emulation|-e`, but not both options.
 
 ### Resolved issues