C++0x PATCH to add -fconstexpr-depth

[Jason Merrill]

The draft standard specifies a minimum limit of 512 recursive constexpr 
calls in order to avoid, say, recursing through the entire range of int. 
  This patch adds a check for this recursion limit and a flag to change 
the limit.

Tested x86_64-pc-linux-gnu, applying to trunk.
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