add assembly test for armv7a-vex-v5

Author: max-niederman

tests/assembly/targets/targets-elf.rs

@@ -177,6 +177,9 @@
 //@ revisions: armv7a_none_eabihf
 //@ [armv7a_none_eabihf] compile-flags: --target armv7a-none-eabihf
 //@ [armv7a_none_eabihf] needs-llvm-components: arm
+//@ revisions: armv7a_vex_v5
+//@ [armv7a_vex_v5] compile-flags: --target armv7a-vex-v5
+//@ [armv7a_vex_v5] needs-llvm-components: arm
 //@ revisions: armv7r_none_eabi
 //@ [armv7r_none_eabi] compile-flags: --target armv7r-none-eabi
 //@ [armv7r_none_eabi] needs-llvm-components: arm