Auto merge of #33084 - alexcrichton:osx-python-sanity, r=michaelwoerister

Sanity check Python on OSX for LLDB tests

Two primary changes:

* Don't get past the configure stage if `python` isn't coming from `/usr/bin`
* Call `debugger.Terminate()` to prevent segfaults on newer versions of LLDB.

Closes #32994

diff --cc configure
Simple merge

diff --cc mk/tests.mk
Simple merge

diff --cc src/tools/compiletest/src/main.rs
Simple merge

diff --cc src/tools/compiletest/src/runtest.rs
Simple merge