6960898: Regression due to src/share/classes/java/lang/ProcessBuilder.java changes

Summary: Use Null{In,Out}putStream.INSTANCE as with Linux code
Reviewed-by: ohair

src/solaris/classes/java/lang/UNIXProcess.java.solaris

@@ -86,7 +86,7 @@ final class UNIXProcess extends Process {
         java.security.AccessController.doPrivileged(
         new java.security.PrivilegedAction<Void>() { public Void run() {
             if (std_fds[0] == -1)
-                stdin_stream = new ProcessBuilder.NullOutputStream();
+                stdin_stream = ProcessBuilder.NullOutputStream.INSTANCE;
             else {
                 FileDescriptor stdin_fd = new FileDescriptor();
                 fdAccess.set(stdin_fd, std_fds[0]);
@@ -95,7 +95,7 @@ final class UNIXProcess extends Process {
             }
 
             if (std_fds[1] == -1)
-                stdout_stream = new ProcessBuilder.NullInputStream();
+                stdout_stream = ProcessBuilder.NullInputStream.INSTANCE;
             else {
                 FileDescriptor stdout_fd = new FileDescriptor();
                 fdAccess.set(stdout_fd, std_fds[1]);
@@ -104,7 +104,7 @@ final class UNIXProcess extends Process {
             }
 
             if (std_fds[2] == -1)
-                stderr_stream = new ProcessBuilder.NullInputStream();
+                stderr_stream = ProcessBuilder.NullInputStream.INSTANCE;
             else {
                 FileDescriptor stderr_fd = new FileDescriptor();
                 fdAccess.set(stderr_fd, std_fds[2]);

src/windows/classes/java/lang/ProcessImpl.java

@@ -159,7 +159,7 @@ final class ProcessImpl extends Process {
         new java.security.PrivilegedAction<Void>() {
         public Void run() {
             if (stdHandles[0] == -1L)
-                stdin_stream = new ProcessBuilder.NullOutputStream();
+                stdin_stream = ProcessBuilder.NullOutputStream.INSTANCE;
             else {
                 FileDescriptor stdin_fd = new FileDescriptor();
                 fdAccess.setHandle(stdin_fd, stdHandles[0]);
@@ -168,7 +168,7 @@ final class ProcessImpl extends Process {
             }
 
             if (stdHandles[1] == -1L)
-                stdout_stream = new ProcessBuilder.NullInputStream();
+                stdout_stream = ProcessBuilder.NullInputStream.INSTANCE;
             else {
                 FileDescriptor stdout_fd = new FileDescriptor();
                 fdAccess.setHandle(stdout_fd, stdHandles[1]);
@@ -177,7 +177,7 @@ final class ProcessImpl extends Process {
             }
 
             if (stdHandles[2] == -1L)
-                stderr_stream = new ProcessBuilder.NullInputStream();
+                stderr_stream = ProcessBuilder.NullInputStream.INSTANCE;
             else {
                 FileDescriptor stderr_fd = new FileDescriptor();
                 fdAccess.setHandle(stderr_fd, stdHandles[2]);