gcc/jit/ChangeLog:
	* docs/internals/index.rst (Running the test suite): Document
	PRESERVE_EXECUTABLES.
	(Running under valgrind): Add markup to RUN_UNDER_VALGRIND.
	* docs/_build/texinfo/libgccjit.texi: Regenerate.

gcc/testsuite/ChangeLog:
	* jit.dg/jit.exp (jit-dg-test): If PRESERVE_EXECUTABLES is set in
	the environment, don't delete the generated executable.

From-SVN: r254282