Attached is Kaz's patch from the PR.

Tested against rev 185555 with 
make -k check RUNTESTFLAGS="--target_board=sh-sim

It fixes a few "sometimes failing" libstdc++ failures.
No new failures otherwise.

OK to apply?

Maybe this one should be backported to 4.7.x, too?



        PR/target 52642
        * config/sh/sh.c (sh_expand_prologue): Emit blockage at the end
        of prologue for unwinder and profiler.

Index: gcc/config/sh/sh.c
--- gcc/config/sh/sh.c	(revision 185554)
+++ gcc/config/sh/sh.c	(working copy)
@@ -7239,6 +7239,13 @@
       emit_insn (gen_shcompact_incoming_args ());
+  /* If we are profiling, make sure no instructions are scheduled before
+     the call to mcount.  Similarly if some call instructions are swapped
+     before frame related insns, it'll confuse the unwinder because
+     currently SH has no unwind info for function epilogues.  */
+  if (crtl->profile || flag_exceptions || flag_unwind_tables)
+    emit_insn (gen_blockage ());
   if (flag_stack_usage_info)
     current_function_static_stack_size = stack_usage;

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