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[Bug bootstrap/82553] memory_blockage breaks bootstrap on powerpc


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82553

--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> ---
The patch does only:

+expand_memory_blockage (void)
+{
+  if (targetm.have_memory_blockage)
+    emit_insn (targetm.gen_memory_blockage ());
+  else
+    expand_asm_memory_blockage ();
+}

So, if the target doesn't declare memory_blockage pattern, as is the
case with rs6000, I really fail to see what could go wrong here.

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