Added elif fix in semantic and llvm so it passes the tests

Author: nspyrop03

llvm/ast.hpp

@@ -1889,13 +1889,16 @@ class IfStmt : public Stmt
         branches.push_back(then_block->check_return_case());
 
         for(IfStmt* i : elifs) {
+            i->isElif = true;
             branches.push_back(i->check_return_case());
         }
 
         if(else_block) {
             branches.push_back(else_block->check_return_case());
         } else {
-            branches.push_back(ReturnInfo(NO_RETURN, false, false));
+            if(!isElif) {
+                branches.push_back(ReturnInfo(NO_RETURN, false, false));
+            }
         }
 
         return combine_if(branches);
@@ -1993,6 +1996,7 @@ class IfStmt : public Stmt
     Block *then_block;
     std::vector<IfStmt *> elifs;
     Block *else_block;
+    bool isElif = false;
 };
 
 class LoopStmt : public Stmt

semantic/ast.hpp

@@ -1093,6 +1093,7 @@ class IfStmt : public Stmt
 
         for (IfStmt *i : elifs)
         {
+            i->isElif = true;
             branches.push_back(i->check_return_case());
         }
 
@@ -1102,7 +1103,9 @@ class IfStmt : public Stmt
         }
         else
         {
-            branches.push_back(ReturnInfo(NO_RETURN, false, false));
+            if(!isElif) {
+                branches.push_back(ReturnInfo(NO_RETURN, false, false));
+            }
         }
 
         return combine_if(branches);
@@ -1113,6 +1116,7 @@ class IfStmt : public Stmt
     Block *then_block;
     std::vector<IfStmt *> elifs;
     Block *else_block;
+    bool isElif = false;
 };
 
 class LoopStmt : public Stmt