chore(compiler): fix string-conversion

compiler/CMakeLists.txt

@@ -12,7 +12,7 @@ add_definitions("-Wno-dollar-in-identifier-extension")
 
 # Wouldn't be able to compile LLVM without this on Mac (using either Clang or AppleClang)
 if(APPLE)
-  add_definitions("-Wno-narrowing -Wno-string-conversion")
+  add_definitions("-Wno-narrowing")
 else()
   add_definitions("-Wall -Werror")
 endif()

compiler/lib/Conversion/Tools.cpp

@@ -60,6 +60,6 @@ mlir::Value getContextArgument(mlir::Operation *op) {
     }
     block = block->getParentOp()->getBlock();
   }
-  assert("can't find a function that enclose the op");
+  assert(false); // can't find a function that enclose the op
   return nullptr;
 }