[lld-macho][test] Rename dtrace test (NFC)

[keith]

Summary

This matches the convention used elsewhere

[thakis]

Shrug :)

[keith]

This came up when I added some tests on another patch, so I figured it makes sense to be consistent so others don't copy the incorrect version

[int3]

Thanks!

lld/test/MachO/x86-64-dtrace.s

 # REQUIRES: x86
 # RUN: rm -rf %t; split-file %s %t
 
 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/x86_64-dtrace.s -o %t/x86_64-dtrace.o
 # RUN: %lld -arch x86_64 -o %t/x86_64-dtrace %t/x86_64-dtrace.o
 
 ## If references of dtrace symbols are handled by lld, their relocation should be replaced with the following instructions
 # RUN: llvm-objdump --macho -D %t/x86_64-dtrace | FileCheck %s --check-prefix=CHECK
 
 # CHECK:      33 c0                   xorl    %eax, %eax
 # CHECK-NEXT: 90                      nop
 # CHECK-NEXT: 90                      nop
 # CHECK-NEXT: 90                      nop
 
 # CHECK:      90                      nop
 # CHECK-NEXT: 0f 1f 40 00             nopl    (%rax)
 
 #--- x86_64-dtrace.s
   .globl  _main
 _main:
   callq ___dtrace_isenabled$Foo$added$v1
   .reference  ___dtrace_typedefs$Foo$v2
   callq ___dtrace_probe$Foo$added$v1$696e74
   .reference  ___dtrace_stability$Foo$v1$1_1_0_1_1_0_1_1_0_1_1_0_1_1_0
   retq
 
 .subsections_via_symbols