implement EXTCODESIZE

Signed-off-by: xermicus <cyrill@parity.io>

crates/llvm-context/src/polkavm/const/runtime_api.rs

@@ -16,6 +16,8 @@ pub static BLOCK_NUMBER: &str = "block_number";
 
 pub static CALLER: &str = "caller";
 
+pub static CODE_SIZE: &str = "code_size";
+
 pub static DEPOSIT_EVENT: &str = "deposit_event";
 
 pub static GET_STORAGE: &str = "get_storage";
@@ -36,7 +38,7 @@ pub static VALUE_TRANSFERRED: &str = "value_transferred";
 
 /// All imported runtime API symbols..
 /// Useful for configuring common attributes and linkage.
-pub static IMPORTS: [&str; 11] = [
+pub static IMPORTS: [&str; 12] = [
     ADDRESS,
     BLOCK_NUMBER,
     CALLER,
@@ -44,6 +46,7 @@ pub static IMPORTS: [&str; 11] = [
     GET_STORAGE,
     HASH_KECCAK_256,
     INPUT,
+    INSTANTIATE,
     NOW,
     RETURN,
     SET_STORAGE,