BaseTools: Fixed a build report issue.

Generate report fail when -Y EXECUTION_ORDER in build command.
This patch is going to fix this issue.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

BaseTools/Source/Python/build/BuildReport.py

@@ -1652,14 +1652,14 @@ class PredictionReport(object):
         GuidList = os.path.join(self._EotDir, "GuidList.txt")
         DispatchList = os.path.join(self._EotDir, "Dispatch.txt")
 
-        TempFile = open(SourceList, "w+")
+        TempFile = []
         for Item in self._SourceList:
             FileWrite(TempFile, Item)
-        TempFile.close()
-        TempFile = open(GuidList, "w+")
+        SaveFileOnChange(SourceList, "".join(TempFile), False)
+        TempFile = []
         for Key in self._GuidMap:
             FileWrite(TempFile, "%s %s" % (Key, self._GuidMap[Key]))
-        TempFile.close()
+        SaveFileOnChange(GuidList, "".join(TempFile), False)
 
         try:
             from Eot.EotMain import Eot