[PATCH][jdk8u] Override TESTDIRS correctly in hotspot

[Siddhesh Poyarekar]

Hi,

I was trying to override TESTDIRS in the test run in hotspot to ensure 
that all of the hotspot tests run but couldn't do that.  It turns out 
this is because TESTDIRS is not overridden correctly; it needs the 
override directive to work correctly.  Attached patch allows me to run 
all of the tests in hotspot using `make test TESTDIRS=. PRODUCT_NAME=...`.

Siddhesh

PS: My contributions should be covered under my employer's (Linaro) 
copyright assignment.

PPS: I ran into this while setting up the aarch64-port, so what's the 
right way to ensure that (if accepted) this fix makes it into the 
aarch64-port too?
-------------- next part --------------
diff -r c747935d0dc6 test/Makefile
--- a/test/Makefile	Tue Nov 13 11:21:32 2018 -0500
+++ b/test/Makefile	Thu Dec 20 12:38:32 2018 +0000
@@ -252,7 +252,7 @@
 
 # When called from JPRT the TESTDIRS variable is set to the jtreg tests to run
 ifdef TESTDIRS
-  TEST_SELECTION = $(TESTDIRS)
+  override TEST_SELECTION = $(TESTDIRS)
 endif
 
 ifdef CONCURRENCY