binutils: use only printable chars in fake labels

Symbols named with name FAKE_LABEL_NAME get emitted when generating DWARF,
so make sure FAKE_LABEL_NAME is printable.  It still must be distinct from
any real label name, so I append a space, which other labels can't contain.

binutils/gas/config/tc-riscv.c

@@ -819,14 +819,8 @@ normalize_constant_expr (expressionS *ex)
 static symbolS *
 make_internal_label (void)
 {
-  static uint32_t count;
-  char name[16];
-
-  sprintf (name, ".LX%d", count);
-  gas_assert (++count != 0);
-
-  return (symbolS *) local_symbol_make (name, now_seg, (valueT) frag_now_fix(),
-					frag_now);
+  return (symbolS *) local_symbol_make (FAKE_LABEL_NAME, now_seg,
+					(valueT) frag_now_fix(), frag_now);
 }
 
 /* Load an entry from the GOT. */

binutils/gas/config/tc-riscv.h

@@ -37,7 +37,7 @@ struct expressionS;
 #define OLD_FLOAT_READS
 #define REPEAT_CONS_EXPRESSIONS
 #define LOCAL_LABELS_FB 1
-#define FAKE_LABEL_NAME ".L0\001"
+#define FAKE_LABEL_NAME ".L0 "
 
 #define md_relax_frag(segment, fragp, stretch) \
   riscv_relax_frag(segment, fragp, stretch)