RFR (XS) 8221726: Multiple build failures after JDK-8221698 (Remove redundant includes from popular header files)

[Aleksey Shipilev]

Bug:
  https://bugs.openjdk.java.net/browse/JDK-8221726

See bug for examples of build failures. Seems only ppc64le and x86_64 {minimal, zero} are affected.
Happy to fold other fixes if other platforms are failing too.

Fix:

diff -r 7ad62bdfec59 src/hotspot/cpu/ppc/gc/shared/barrierSetAssembler_ppc.cpp
--- a/src/hotspot/cpu/ppc/gc/shared/barrierSetAssembler_ppc.cpp Sun Mar 31 23:29:47 2019 +0200
+++ b/src/hotspot/cpu/ppc/gc/shared/barrierSetAssembler_ppc.cpp Sun Mar 31 23:52:49 2019 +0200
@@ -28,4 +28,5 @@
 #include "gc/shared/barrierSetAssembler.hpp"
 #include "interpreter/interp_masm.hpp"
+#include "runtime/jniHandles.hpp"

 #define __ masm->
diff -r 7ad62bdfec59 src/hotspot/share/classfile/systemDictionary.hpp
--- a/src/hotspot/share/classfile/systemDictionary.hpp  Sun Mar 31 23:29:47 2019 +0200
+++ b/src/hotspot/share/classfile/systemDictionary.hpp  Sun Mar 31 23:52:49 2019 +0200
@@ -31,4 +31,5 @@
 #include "oops/symbol.hpp"
 #include "runtime/java.hpp"
+#include "runtime/mutexLocker.hpp"
 #include "runtime/reflectionUtils.hpp"
 #include "runtime/signature.hpp"

Testing: Linux x86_64 {server, minimal, zero}, ppc64le builds

Thanks,
-Aleksey