Fix ivopts estimates for internal functions

[Richard Sandiford]

tree-ssa-loop-ivopts.c:loop_body_includes_call was treating internal
calls such as IFN_SQRT as clobbering all caller-saved registers, which
I don't think is appropriate for any current internal function.

Tested on aarch64-linux-gnu and x86_64-linux-gnu.  OK to install?

Thanks,
Richard


gcc/
        * tree-ssa-loop-ivopts.c (loop_body_includes_call): Don't assume
        that internal functions will clobber all caller-saved registers.

diff --git a/gcc/tree-ssa-loop-ivopts.c b/gcc/tree-ssa-loop-ivopts.c
index 9ce6b64..23c9886 100644
--- a/gcc/tree-ssa-loop-ivopts.c
+++ b/gcc/tree-ssa-loop-ivopts.c
@@ -7643,6 +7643,7 @@ loop_body_includes_call (basic_block *body, unsigned 
num_nodes)
       {
        gimple *stmt = gsi_stmt (gsi);
        if (is_gimple_call (stmt)
+           && !gimple_call_internal_p (stmt)
            && !is_inexpensive_builtin (gimple_call_fndecl (stmt)))
          return true;
       }