RFR 8199467 Compilation Errors in libinstrument Reentrancy.c with VS2017

[Roger Riggs]

Please review a small change to avoid sign extension in libinstrument/ 
Reentrancy.c
to correct an compilation warning with vs2017.

diff --git a/src/java.instrument/share/native/libinstrument/Reentrancy.c 
b/src/java.instrument/share/native/libinstrument/Reentrancy.c
--- a/src/java.instrument/share/native/libinstrument/Reentrancy.c
+++ b/src/java.instrument/share/native/libinstrument/Reentrancy.c
@@ -90,7 +90,7 @@ assertTLSValue( jvmtiEnv *      jvmtienv
                 jthread         thread,
                 const void *    expected) {
     jvmtiError  error;
-    void *      test = (void *) 0x99999999;
+    void *      test = (void *) 0x99999999ul;
     /* now check if we do a fetch we get what we wrote */
     error = (*jvmtienv)->GetThreadLocalStorage(

Issue:
  https://bugs.openjdk.java.net/browse/JDK-8199467

Thanks, Roger