Fix process leak in process enumeration. Dispose rejected ones. (#10186)

This #10143 and fix is from there.

I considered nulling the array elements as I go, and then the tail,
to help the GC, but does it help actually? I suspect not.

mcs/class/System/System.Diagnostics/Process.cs

@@ -508,9 +508,12 @@ public static Process[] GetProcessesByName(string processName, string machineNam
 			int size = 0;
 
 			for (int i = 0; i < processes.Length; i++) {
+				var process = processes[i];
 				try {
-					if (String.Compare (processName, processes[i].ProcessName, true) == 0)
-						processes [size++] = processes[i];
+					if (String.Compare (processName, process.ProcessName, true) == 0)
+						processes [size++] = process;
+					else
+						process.Dispose();
 				} catch (SystemException) {
 					/* The process might exit between GetProcesses_internal and GetProcessById */
 				}