Don't run test on emscripten which doesn't have threads

Amanieu · Mark-Simulacrum · commit 228ab4709ada · 2020-06-26T09:35:27.000-04:00
diff --git a/src/test/ui/tls.rs b/src/test/ui/tls.rs
@@ -1,4 +1,5 @@
 // run-pass
+// ignore-emscripten no threads support
 // compile-flags: -O
 
 #![feature(thread_local)]

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,5 @@`
`1`	`1`	`// run-pass`
	`2`	`+// ignore-emscripten no threads support`
`2`	`3`	`// compile-flags: -O`
`3`	`4`
`4`	`5`	`#![feature(thread_local)]`