Add test revisions.

Author: reitermarkus

tests/codegen/char-escape-debug-no-bounds-check.rs

@@ -1,4 +1,15 @@
 //@ compile-flags: -Copt-level=3
+//@ add-core-stubs
+//@ revisions: linux win macos thumb
+//
+//@[linux] compile-flags: --target x86_64-unknown-linux-gnu
+//@[linux] needs-llvm-components: x86
+//@[win] compile-flags: --target x86_64-pc-windows-gnu
+//@[win] needs-llvm-components: x86
+//@[macos] compile-flags: --target aarch64-apple-darwin
+//@[macos] needs-llvm-components: arm
+//@[thumb] compile-flags: --target thumbv7em-none-eabi
+//@[thumb] needs-llvm-components: arm
 #![crate_type = "lib"]
 
 use std::char::EscapeDebug;