All of the jit testcases that generate debuginfo appear to have been
failing since r240228 on their 2nd in-process iteration on this
assertion in set_early_dwarf's ctor:
gcc_assert (! early_dwarf_finished);
Root cause is that the global is never reset at the end of compilation,
which this patch fixes in the obvious way.
gcc/ChangeLog:
* dwarf2out.c (dwarf2out_c_finalize): Reset early_dwarf and
early_dwarf_finished.
From-SVN: r243136
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