Fix trampoline assembly for build on clang 18 on apple silicon (#54634)

This avoids a: `error: non-private labels cannot appear between
.cfi_startproc / .cfi_endproc pairs` error.
That error was introduced in https://reviews.llvm.org/D155245#4657075
see also llvm/llvm-project#72802

cli/trampolines/trampolines_aarch64.S

@@ -5,9 +5,9 @@
 
 #define XX(name) \
 .global CNAME(name) SEP \
+CNAME(name)##: SEP \
 .cfi_startproc SEP \
 .p2align 2 SEP \
-CNAME(name)##: SEP \
  adrp x16, PAGE(CNAME(name##_addr)) SEP \
  ldr x16, [x16, PAGEOFF(CNAME(name##_addr))] SEP \
  br x16 SEP \