Skip tests on emscripten

Author: JohnTitor

src/test/ui/array-slice-vec/bounds-check-no-overflow.rs

@@ -1,5 +1,6 @@
 // run-fail
 // error-pattern:index out of bounds
+// ignore-emscripten no processes
 
 use std::usize;
 use std::mem::size_of;

src/test/ui/array-slice-vec/dst-raw-slice.rs

@@ -2,6 +2,8 @@
 
 // run-fail
 // error-pattern:index out of bounds
+// ignore-emscripten no processes
+
 #[allow(unconditional_panic)]
 fn main() {
     let a: *const [_] = &[1, 2, 3];