[PATCH] Fix PR middle-end/22313 -freorder-blocks-and-partition vs dwarf2 undwind tables

[Andrew Pinski]

The problem here is that without -g, dwarf2out does not
get notified of the textswitch so we get create a difference
between two labels in two different sections.  This fixes the
problem by exporting dwarf2out_switch_text_section and calling
it when processing NOTE_INSN_SWITCH_TEXT_SECTIONS if we need
to.

OK? Profiledbootstrapped with BOOT_CFLAGS="-O2" and a normal
bootstrap and test on x86_64-pc-linux-gnu with no regressions.

Thanks,
Andrew Pinski

ChangeLog:

	* dwarf2out.c (dwarf2out_switch_text_section): Export.
	* debug.h (dwarf2out_switch_text_section): Prototype.
	* final.c (final_scan_insn): Call dwarf2out_switch_text_section
	if we need to call it for dwarf2 unwind info.
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