Add test showing different KIND parameters change hash

src/test/run-make/emit-path-unhashed/Makefile

@@ -3,14 +3,20 @@
 OUT=$(TMPDIR)/emit
 
 # --emit KIND=PATH should not affect crate hash vs --emit KIND
-all: $(OUT)/a/libfoo.rlib $(OUT)/b/libfoo.rlib $(TMPDIR)/libfoo.rlib
+all: $(OUT)/a/libfoo.rlib $(OUT)/b/libfoo.rlib $(OUT)/c/libfoo.rlib \
+		$(TMPDIR)/libfoo.rlib
 	$(RUSTC) -Zls $(TMPDIR)/libfoo.rlib > $(TMPDIR)/base.txt
 	$(RUSTC) -Zls $(OUT)/a/libfoo.rlib > $(TMPDIR)/a.txt
 	$(RUSTC) -Zls $(OUT)/b/libfoo.rlib > $(TMPDIR)/b.txt
+	$(RUSTC) -Zls $(OUT)/c/libfoo.rlib > $(TMPDIR)/c.txt
 
 	diff $(TMPDIR)/base.txt $(TMPDIR)/a.txt
 	diff $(TMPDIR)/base.txt $(TMPDIR)/b.txt
 
+	# Different KIND parameters do affect hash.
+	# diff exits 1 on difference, 2 on trouble
+	diff $(TMPDIR)/base.txt $(TMPDIR)/c.txt ; test "$$?" -eq 1
+
 # Default output name
 $(TMPDIR)/libfoo.rlib: foo.rs
 	$(RUSTC) --emit link foo.rs
@@ -24,3 +30,8 @@ $(OUT)/a/libfoo.rlib: foo.rs
 $(OUT)/b/libfoo.rlib: foo.rs
 	mkdir -p $(OUT)/b
 	$(RUSTC) --emit link=$@ foo.rs
+
+# Output multiple kinds
+$(OUT)/c/libfoo.rlib: foo.rs
+	mkdir -p $(OUT)/c
+	$(RUSTC) --emit link=$@,metadata foo.rs