Fix x86-64: Add R_X86_64_CODE_4_GOTPCRELX

commit 3d5a60de52
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Thu Jun 8 10:01:03 2023 -0700

    x86-64: Add R_X86_64_CODE_4_GOTPCRELX

added a new field, fx_tcbit3, to fix.  But it didn't initialize it.
Fix it by clearing it in fix_new_internal.

	* wrtite.c (fix_new_internal): Clear fx_tcbit3.

gas/write.c

@@ -169,6 +169,7 @@ fix_new_internal (fragS *frag,		/* Which frag?  */
   fixP->fx_addnumber = 0;
   fixP->fx_tcbit = 0;
   fixP->fx_tcbit2 = 0;
+  fixP->fx_tcbit3 = 0;
   fixP->fx_done = 0;
   fixP->fx_no_overflow = 0;
   fixP->fx_signed = 0;