[PATCH] [libc++] Check the support of default function template args.

[Logan Chien]

Ping.  Any further comments?

This patch tries to reduce the usage of the default function template
arguments, which is not supported in pre-C++0x.  Without this change, we
will get compilation error from g++ if we tries to include libc++ headers
in pre-C++0x mode.

To remove the usage of default function template arguments, the patch moves
the enable_if<> to return type or the function argument types.  This
pattern is used in the other code of libc++ as well.

Please let me know if you have any comments.  Thanks.

Sincerely,
Logan
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