[analyzer]  Add .cxx and .txx as known file extensions to ccc-analyzer.

A patch by Sean McBride.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154751 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/scan-build/ccc-analyzer b/tools/scan-build/ccc-analyzer
index 32a7301..d01bd0f 100755
--- a/tools/scan-build/ccc-analyzer
+++ b/tools/scan-build/ccc-analyzer
@@ -387,6 +387,8 @@
   'c'   => 'c',
   'cp'  => 'c++',
   'cpp' => 'c++',
+  'cxx' => 'c++',
+  'txx' => 'c++',
   'cc'  => 'c++',
   'ii'  => 'c++',
   'i'   => 'c-cpp-output',