Add a extract-function-index pass

This is a useful alternative to extract-function when you don't know the
function's name.

Also moves the extract-function tests to be lit tests and re-uses them as
extract-function-index tests.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/passes/pass.cpp b/src/passes/pass.cpp
index 89b367272..10a688313 100644
--- a/src/passes/pass.cpp
+++ b/src/passes/pass.cpp
@@ -129,6 +129,9 @@ void PassRegistry::registerPasses() {
   registerPass("extract-function",
                "leaves just one function (useful for debugging)",
                createExtractFunctionPass);
+  registerPass("extract-function-index",
+               "leaves just one function selected by index",
+               createExtractFunctionIndexPass);
   registerPass(
     "flatten", "flattens out code, removing nesting", createFlattenPass);
   registerPass("fpcast-emu",