[GR-55075] Output from Java wrapper launchers diverted to stderr.

PullRequest: graal/18201

Author: zslajchrt

sulong/projects/com.oracle.truffle.llvm.toolchain.launchers/src/com/oracle/truffle/llvm/toolchain/launchers/common/Driver.java

@@ -200,7 +200,7 @@ public final int runDriverReturn(List<String> sulongArgs, List<String> userArgs,
             // set exit code
             int exitCode = p.exitValue();
             if (verbose) {
-                System.out.println("exit code: " + exitCode);
+                System.err.println("exit code: " + exitCode);
             }
             return exitCode;
         } catch (IOException ioe) {
@@ -251,9 +251,9 @@ private void printInfos(boolean verbose, boolean help, boolean earlyExit, ArrayL
             System.out.println("GraalVM version: " + getVersion());
         }
         if (verbose) {
-            System.out.println("GraalVM wrapper script for " + getTool());
-            System.out.println("GraalVM version: " + getVersion());
-            System.out.println("running: " + String.join(" ", toolArgs));
+            System.err.println("GraalVM wrapper script for " + getTool());
+            System.err.println("GraalVM version: " + getVersion());
+            System.err.println("running: " + String.join(" ", toolArgs));
         }
         if (help) {
             if (!earlyExit) {