flambda-backend: Add -no-rebuild options for test-one and promote-one (#1391)

Author: ncik-roberts

Makefile.common-jst

@@ -307,15 +307,19 @@ promote-failed:
 
 runtest-upstream: test
 
-test-one: install_for_test
+test-one: install_for_test test-one-no-rebuild
+
+test-one-no-rebuild:
 	(export OCAMLSRCDIR=$$(pwd)/_runtest; \
 	 export CAML_LD_LIBRARY_PATH=$$(pwd)/_runtest/lib/ocaml/stublibs; \
 	 if $$(which gfortran > /dev/null 2>&1); then \
 	   export LIBRARY_PATH=$$(dirname $$(gfortran -print-file-name=libgfortran.a)); \
 	 fi; \
 	 cd _runtest/testsuite && make one $(if $(TEST),TEST="tests/$(TEST)") $(if $(DIR),DIR="tests/$(DIR)"))
 
-promote-one: install_for_test
+promote-one: install_for_test promote-one-no-rebuild
+
+promote-one-no-rebuild:
 	(export OCAMLSRCDIR=$$(pwd)/_runtest; \
 	 export CAML_LD_LIBRARY_PATH=$$(pwd)/_runtest/lib/ocaml/stublibs; \
 	 if $$(which gfortran > /dev/null 2>&1); then \