RFR(two-liner): 8212707: GlobalCounter padding is too optimistic

[Robbin Ehn]

Hi all, please review.

We should not divide DEFAULT_CACHE_LINE_SIZE by 2.
More info in issue:
https://bugs.openjdk.java.net/browse/JDK-8212707

Code: below

Sanity with T1.

Thanks, Robbin

diff -r bca2b63dd839 src/hotspot/share/utilities/globalCounter.hpp
--- a/src/hotspot/share/utilities/globalCounter.hpp	Mon Oct 22 14:08:07 2018 +0800
+++ b/src/hotspot/share/utilities/globalCounter.hpp	Mon Oct 22 11:48:17 2018 +0200
@@ -48,1 +48,1 @@
-    DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE/2, 0);
+    DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE, 0);
@@ -50,1 +50,1 @@
-    DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE/2, sizeof(volatile uintx));
+    DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile uintx));