Attached Test2.java demonstrates that C2 does not remove unused runtime calls emitted for drem/frem.

java -XX:-TieredCompilation -XX:CompileCommand=print,Test2::test1 -Xbatch Test2.java

[...]

  0x00007467451ccd44:   callq  *%r10
  0x00007467451ccd47:   nopl   0x0(%rax,%rax,1)             ;*frem {reexecute=0 rethrow=0 return_oop=0}
                                                            ; - Test2::test2@2 (line 8)
                                                            ;   {post_call_nop}
  0x00007467451ccd4f:   add    $0x10,%rsp


[...]

This is a follow-up from JDK-8345766.