Potential Fix for PR38753 - Missing return value issue.
Noop Kill instructions would be classified as a clobber of the register they kill by the debug entity calculator. This would in turn close the range of a preceding debug intrinsic that could potentially have it's range extended past the KILL instructions invocation.
This patch address this issue by making the Debug History Entity Calculator ignore Kill instructions when calculating location list ranges. Two tests failed as result, these have now been fixed up and a new test has been added that specifically tests for this exact case.