Add xtensa arch to object file creation

Author: MabezDev

compiler/rustc_codegen_ssa/src/back/metadata.rs

@@ -245,6 +245,7 @@ pub(crate) fn create_object_file(sess: &Session) -> Option<write::Object<'static
         "avr" => (Architecture::Avr, None),
         "msp430" => (Architecture::Msp430, None),
         "hexagon" => (Architecture::Hexagon, None),
+        "xtensa" => (Architecture::Xtensa, None),
         "bpf" => (Architecture::Bpf, None),
         "loongarch64" => (Architecture::LoongArch64, None),
         "csky" => (Architecture::Csky, None),