RFR: 8079441: Intermittent failures on Windows with "Unexpected exit from test [exit code: 1080890248]" (0x406d1388)

[Robbin Ehn]

Hi all, please review.

We still have exit code 1080890248/0x406d1388 on windows when running kitchensink.
Since this is the same value as windows thread name exception:
http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
and we are still suspicious about this.

This is not a bug fix per se, but it will determine if this exception is the cause of this
and if so only when a debugger is attached this failure can happen.

Bug: https://bugs.openjdk.java.net/browse/JDK-8079441

Tested with windbg and passes winx64 hotspot_jprt.

/Robbin

--- a/src/os/windows/vm/os_windows.cpp	Mon Jan 09 19:36:47 2017 +0000
+++ b/src/os/windows/vm/os_windows.cpp	Tue Jan 10 11:00:45 2017 +0100
@@ -777,6 +777,11 @@
    // Note that unfortunately this only works if the process
    // is already attached to a debugger; debugger must observe
    // the exception below to show the correct name.
+
+  // If there is no debugger attached skip raising the exception
+  if (!IsDebuggerPresent()) {
+    return;
+  }

    const DWORD MS_VC_EXCEPTION = 0x406D1388;
    struct {