RFR 8203454: Minimal, Zero builds fail after JDK-8202377 (Modularize C2 barriers)

[Aleksey Shipilev]

Bug:
  https://bugs.openjdk.java.net/browse/JDK-8203454

Other GCs that would eventually bring their own BarrierSetC2 files (e.g. 
Epsilon, Shenandoah, ZGC)
would require excluding their "gc/<name>/c2" as well.

Fix:

diff -r 5ec7380f671d make/hotspot/lib/JvmFeatures.gmk
--- a/make/hotspot/lib/JvmFeatures.gmk  Fri May 18 18:31:28 2018 -0700
+++ b/make/hotspot/lib/JvmFeatures.gmk  Sat May 19 11:01:16 2018 +0200
@@ -41,7 +41,7 @@
 else
   JVM_EXCLUDES += opto libadt
   JVM_EXCLUDE_FILES += bcEscapeAnalyzer.cpp ciTypeFlow.cpp
-  JVM_EXCLUDE_PATTERNS += c2_ runtime_
+  JVM_EXCLUDE_PATTERNS += c2_ runtime_ gc/shared/c2 gc/g1/c2
 endif

 ifeq ($(call check-jvm-feature, zero), true)

Testing: {x86-minimal, x86_64-zero, x86_64-server} builds

Thanks,
-Aleksey