gh-141808: Don't remove the JIT stencils when building with PGO

Makefile.pre.in

@@ -3239,7 +3239,6 @@ clean-retain-profile: pycremoval
 	-rm -rf Python/deepfreeze
 	-rm -f Python/frozen_modules/*.h
 	-rm -f Python/frozen_modules/MANIFEST
-	-rm -f jit_stencils*.h
 	-find build -type f -a ! -name '*.gc??' -exec rm -f {} ';'
 	-rm -f Include/pydtrace_probes.h
 	-rm -f profile-gen-stamp
@@ -3277,11 +3276,16 @@ clobber: clean
 	-rm -f python-config.py python-config
 	-rm -rf cross-build
 
+# gh-141808: The JIT stencils are deliberately kept in make clean(-retain-profile)
+.PHONY: clean-jit-stencils
+clean-jit-stencils:
+	-rm -f jit_stencils*.h
+
 # Make things extra clean, before making a distribution:
 # remove all generated files, even Makefile[.pre]
 # Keep configure and Python-ast.[ch], it's possible they can't be generated
 .PHONY: distclean
-distclean: clobber docclean
+distclean: clobber docclean clean-jit-stencils
 	for file in $(srcdir)/Lib/test/data/* ; do \
 	    if test "$$file" != "$(srcdir)/Lib/test/data/README"; then rm "$$file"; fi; \
 	done

Misc/NEWS.d/next/Build/2025-11-20-23-15-39.gh-issue-141808.NEewZC.rst

@@ -0,0 +1,4 @@
+When running ``make clean`` or ``make clean-retain-profile``, keep the
+generated JIT stencils. That way, the stencils are not generated twice when
+Profile-guided optimization (PGO) is used. It also allows distributors to
+supply their own pre-built JIT stencils.