tcg/arm: Remove reloc_pc24_atomic

It is unused since 3fb53fb4.
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

tcg/arm/tcg-target.inc.c

@@ -193,14 +193,6 @@ static inline void reloc_pc24(tcg_insn_unit *code_ptr, tcg_insn_unit *target)
     *code_ptr = (*code_ptr & ~0xffffff) | (offset & 0xffffff);
 }
 
-static inline void reloc_pc24_atomic(tcg_insn_unit *code_ptr, tcg_insn_unit *target)
-{
-    ptrdiff_t offset = (tcg_ptr_byte_diff(target, code_ptr) - 8) >> 2;
-    tcg_insn_unit insn = atomic_read(code_ptr);
-    tcg_debug_assert(offset == sextract32(offset, 0, 24));
-    atomic_set(code_ptr, deposit32(insn, 0, 24, offset));
-}
-
 static void patch_reloc(tcg_insn_unit *code_ptr, int type,
                         intptr_t value, intptr_t addend)
 {