[lto] add DW_LANG_C_plus_plus to the list of supported languages

[Ollie Wild]

This patch adds DW_LANG_C_plus_plus to the list of supported languages
in lto_read_compile_unit_DIE().  This is a prerequisite to adding C++
support to LTO.  Otherwise, the lto driver simply fails with an
"unsupported language" error.

Ollie

2008-04-15  Ollie Wild <aaw@google.com>

	* lto.c (lto_read_compile_unit_DIE): Add DW_LANG_C_plus_plus to the
	list of supported languages.
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