[FRONTEND] Complete rewrite of the runtime (#644)

This PR completely rewrites the runtime of Triton to be more lean and
clearly separate the compilation step from the just-in-time caching logic.
This should substantially reduce launch overhead.

include/triton/codegen/extern_lib.h

@@ -3,6 +3,7 @@
 
 #include <memory>
 #include <string>
+#include <map>
 
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"

include/triton/ir/module.h

@@ -87,7 +87,6 @@ public:
 
   // Functions
   const functions_list_t &get_function_list() const { return functions_; }
-  functions_list_t &get_function_list()             { return functions_; }
   function *get_function(const std::string& name)   {
     if(symbols_.find(name) == symbols_.end())
       throw std::runtime_error("function " + name + " is not declared");