common.opt: Add -fcombine-stack-adjustments.

        * common.opt: Add -fcombine-stack-adjustments.
        * opts.c (decode_options): Enable -fcombine-stack-adjustments at
        -O1.
        * combine-stack-adj.c (gate_handle_stack_adjustments): Check
        flag_combine_stack_adjustments.
        * doc/invoke.texi: Document the new option.

From-SVN: r164883

1 files changed, 1 insertions, 0 deletions

diff --git a/gcc/opts.c b/gcc/opts.c
index 2b2071e..88321b5 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -801,6 +801,7 @@ decode_options (unsigned int argc, const char **argv,
   flag_tree_copy_prop = opt1;
   flag_tree_sink = opt1;
   flag_tree_ch = opt1;
+  flag_combine_stack_adjustments = opt1;
 
   /* -O2 optimizations.  */
   opt2 = (optimize >= 2);