[SystemZ] Assembler does not recognize `symbol@GOTENT` syntax

[alexrp]

Happens when assembling glibc start code:

/home/alexrp/Source/zig/lib/libc/glibc/sysdeps/s390/s390-64/crti.S:70:26: error: invalid variant 'GOTENT'
 larl %r1,__gmon_start__@GOTENT
                         ^
/home/alexrp/Source/zig/lib/libc/glibc/sysdeps/s390/s390-64/crti.S:70:32: error: unknown token in expression
 larl %r1,__gmon_start__@GOTENT
                               ^
/home/alexrp/Source/zig/lib/libc/glibc/sysdeps/s390/s390-64/crti.S:70:32: error: unknown token in expression
 larl %r1,__gmon_start__@GOTENT
                               ^

This is with LLVM 18.1.8.