[PATCH] Attribute parsing following labels

[Aaron Ballman]

In C++ mode, attributes following labels can be ambiguous as they
could apply either to the label, or to a declaration following the
label.  According to
http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html, a GNU
attribute following a label in C++ mode is only legal if the token
after the attribute is a semicolon.  This patch addresses PR8455.

~Aaron
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