SPEC for hotspot IMPL JDK setting by AUTO_DETECT as without _cmprssptrs

Running with github action or running in developer's local environment without export SPEC EnvDetector will generate autoGenEnv.mk to setting DETECTED_SPEC. And DETECTED_SPEC will be set as SPEC as nodefine SPEC.
https://github.com/AdoptOpenJDK/TKG/blob/master/envSettings.mk#L25

For non-openj9 JDK, DETECTED_SPEC will be set as without _cmprssptrs.
https://github.com/AdoptOpenJDK/TKG/blob/master/src/org/openj9/envInfo/JavaInfo.java#L75

This is inconsistent with jenkins story, which set SPEC per platform. All non large heap 64 platforms is setting as _cmprssptrs.
https://github.com/AdoptOpenJDK/openjdk-tests/blob/master/buildenv/jenkins/openjdk_tests

Also this inconsistence is hidden by the check https://github.com/AdoptOpenJDK/TKG/blob/master/envSettings.mk#L33

Compare the SPEC handling in envSettings.mk at lines 25 and 33 with detection in src/org/openj9/envInfo/JavaInfo.java at line 75 and the platform settings in buildenv/jenkins/openjdk_tests. Trace AUTO_DETECT for non-OpenJ9 JDKs and verify that generated DETECTED_SPEC matches the Jenkins behavior, including the _cmprssptrs distinction.

Written by the indexing model from the issue text.