add python scripts related to lit

docs/Doxyfile

Index: docs/Doxyfile
diff --git a/docs/Doxyfile b/docs/Doxyfile
index 4e9b2ffab3026386c918dca53b49163f4eadfd6d..0104e8e5ca248241bfd076264809acd18104136e 100644
--- a/docs/Doxyfile
+++ b/docs/Doxyfile
@@ -270,7 +270,7 @@ OPTIMIZE_OUTPUT_VHDL   = NO
 # Note that for custom extensions you also need to set FILE_PATTERNS otherwise
 # the files are not read by doxygen.
 
-EXTENSION_MAPPING      =
+EXTENSION_MAPPING      = lit.cfg=Python
 
 # If the MARKDOWN_SUPPORT tag is enabled then doxygen pre-processes all comments
 # according to the Markdown format, which allows for more readable
@@ -750,7 +750,9 @@ INPUT                  = "../src" \
                          "../../llvm/include/llvm/IR" \
                          "../../llvm/include/llvm/IRReader" \
                          "../../llvm/include/llvm/Support" \
-                         "../pydir"
+                         "../pydir" \
+                         "../tests_lit/lit.cfg" \
+                         "../../llvm/utils/lit"
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses