Refactor interaction between Pass and PassRunner (#5093)

Previously only WalkerPasses had access to the `getPassRunner` and
`getPassOptions` methods. Move those methods to `Pass` so all passes can use
them. As a result, the `PassRunner` passed to `Pass::run` and
`Pass::runOnFunction` is no longer necessary, so remove it.

Also update `Pass::create` to return a unique_ptr, which is more efficient than
having it return a raw pointer only to have the `PassRunner` wrap that raw
pointer in a `unique_ptr`.

Delete the unused template `PassRunner::getLast()`, which looks like it was
intended to enable retrieving previous analyses and has been in the code base
since 2015 but is not implemented anywhere.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/passes/Strip.cpp b/src/passes/Strip.cpp
index 7c9f61061..00cd87ae0 100644
--- a/src/passes/Strip.cpp
+++ b/src/passes/Strip.cpp
@@ -36,7 +36,7 @@ struct Strip : public Pass {
 
   Strip(Decider decider) : decider(decider) {}
 
-  void run(PassRunner* runner, Module* module) override {
+  void run(Module* module) override {
     // Remove name and debug sections.
     auto& sections = module->userSections;
     sections.erase(std::remove_if(sections.begin(), sections.end(), decider),