flambda-backend: Fix dumpobj installation properly

Author: mshinwell

Makefile.common-jst

@@ -273,7 +273,7 @@ install_for_test: _install
 	mkdir _runtest/tools
 	ln -s ../_install/bin/ocamlmklib.byte _runtest/tools/ocamlmklib
 	ln -s ../_install/bin/ocamlobjinfo.byte _runtest/tools/ocamlobjinfo
-	ln -s ../../_build/main/ocaml/tools/dumpobj.bc _runtest/tools/dumpobj
+	ln -s ../_install/bin/dumpobj.byte _runtest/tools/dumpobj
         # ocamldoc
 	rm _runtest/ocamldoc
 	mkdir _runtest/ocamldoc

tools/dune

@@ -60,6 +60,14 @@
   (modules dumpobj)
   (libraries ocamlcommon ocamlbytecomp opnames))
 
+(install
+  (files
+    (dumpobj.bc as dumpobj.byte)
+    (dumpobj.exe as dumpobj.opt)
+  )
+  (section bin)
+  (package ocaml))
+
 (executable
   (name cmpbyt)
   (modes byte)