Disable -Zfunction-sections by default on MSVC

To workaround a hang in link.exe.

Author: bjorn3

src/driver/aot.rs

@@ -333,8 +333,11 @@ fn make_module(sess: &Session, name: String) -> UnwindModule<ObjectModule> {
 
     let mut builder =
         ObjectBuilder::new(isa, name + ".o", cranelift_module::default_libcall_names()).unwrap();
+    // Disable function sections by default on MSVC as it causes significant with link.exe. Maybe
+    // link.exe has exponential behavior when there are many sections with the same name?
+    let default_function_sections = sess.target.function_sections && !sess.target.is_like_msvc;
     builder.per_function_section(
-        sess.opts.unstable_opts.function_sections.unwrap_or(sess.target.function_sections),
+        sess.opts.unstable_opts.function_sections.unwrap_or(default_function_sections),
     );
     UnwindModule::new(ObjectModule::new(builder), true)
 }