Let CStrings be either 1 or 2 byte aligned.

Some architectures (like s390x) require strings to be 2 byte aligned.
Therefor the section name will be marked with a .2  postfix on this
architectures.

Allowing a section name with a .1 or .2 postfix will make the test pass
on either platform.

Author: fneddy

Diff for: tests/assembly/cstring-merging.rs

@@ -5,7 +5,7 @@
 
 use std::ffi::CStr;
 
-// CHECK: .section .rodata.str1.1,"aMS"
+// CHECK: .section .rodata.str1.{{[12]}},"aMS"
 // CHECK: .Lanon.{{.+}}:
 // CHECK-NEXT: .asciz "foo"
 #[unsafe(no_mangle)]