[committed] Remove redundant variable from tree-call-cdce.c

[Richard Sandiford <richard dot sandiford at arm dot com>]

shrink_wrap_one_built_in_call had both guard_bb and guard_bb0.
It looks like an earlier version of the pass may have updated
one of the variables in the while loop, but now they're just
two names for the same thing.

Tested on x86_64-linux-gnu, aarch64-linux-gnu and arm-linux-gnueabi.
Committed as obvious.

Thanks,
Richard


gcc/
	* tree-call-cdce.c (shrink_wrap_one_built_in_call): Remove
	guard_bb0 and use guard_bb throughout.

diff --git a/gcc/tree-call-cdce.c b/gcc/tree-call-cdce.c
index e68d03d..ff5cd9b 100644
--- a/gcc/tree-call-cdce.c
+++ b/gcc/tree-call-cdce.c
@@ -717,7 +717,7 @@ static bool
 shrink_wrap_one_built_in_call (gcall *bi_call)
 {
   gimple_stmt_iterator bi_call_bsi;
-  basic_block bi_call_bb, join_tgt_bb, guard_bb, guard_bb0;
+  basic_block bi_call_bb, join_tgt_bb, guard_bb;
   edge join_tgt_in_edge_from_call, join_tgt_in_edge_fall_thru;
   edge bi_call_in_edge0, guard_bb_in_edge;
   unsigned tn_cond_stmts, nconds;
@@ -775,22 +775,21 @@ shrink_wrap_one_built_in_call (gcall *bi_call)
   bi_call_in_edge0 = split_block (bi_call_bb, cond_expr);
   bi_call_in_edge0->flags &= ~EDGE_FALLTHRU;
   bi_call_in_edge0->flags |= EDGE_TRUE_VALUE;
-  guard_bb0 = bi_call_bb;
+  guard_bb = bi_call_bb;
   bi_call_bb = bi_call_in_edge0->dest;
-  join_tgt_in_edge_fall_thru = make_edge (guard_bb0, join_tgt_bb,
+  join_tgt_in_edge_fall_thru = make_edge (guard_bb, join_tgt_bb,
                                           EDGE_FALSE_VALUE);
 
   bi_call_in_edge0->probability = REG_BR_PROB_BASE * ERR_PROB;
   bi_call_in_edge0->count =
-      apply_probability (guard_bb0->count,
+      apply_probability (guard_bb->count,
 			 bi_call_in_edge0->probability);
   join_tgt_in_edge_fall_thru->probability =
       inverse_probability (bi_call_in_edge0->probability);
   join_tgt_in_edge_fall_thru->count =
-      guard_bb0->count - bi_call_in_edge0->count;
+      guard_bb->count - bi_call_in_edge0->count;
 
   /* Code generation for the rest of the conditions  */
-  guard_bb = guard_bb0;
   while (nconds > 0)
     {
       unsigned ci0;