Fix warnings about redundant/pessimizing moves

src/codegen/compvars.cpp

@@ -2545,7 +2545,7 @@ public:
         for (int i = 0; i < orig_elts.size(); i++) {
             elts.push_back(orig_elts[i]->dup(cache));
         }
-        return std::move(elts);
+        return elts;
     }
 
     ConcreteCompilerVariable* _makeConverted(IREmitter& emitter, const VEC& v, ConcreteCompilerType* other_type) {

src/codegen/parser.cpp

@@ -1200,7 +1200,7 @@ static std::vector<char> _reparse(const char* fn, const std::string& cache_fn, A
         fwrite(&checksum, 1, CHECKSUM_LENGTH, cache_fp);
     memcpy(&file_data[checksum_start + LENGTH_LENGTH], &checksum, CHECKSUM_LENGTH);
 
-    return std::move(file_data);
+    return file_data;
 }
 
 // Parsing the file is somewhat expensive since we have to shell out to cpython;