C++ PATCH for c++/49260 (lambda-eh2.C failure on several targets)

[Jason Merrill]

This failure was happening on all targets that don't use either CFI 
assembler directives or asynchronous unwind tables: we were mistakenly 
deciding that the _FUN thunk for returning from the lambda function 
pointer conversion operator couldn't throw because build_call_a wasn't 
setting cp_function_chain->can_throw.  There seems to be no reason to 
set that flag in build_cxx_call rather than build_call_a, so I've moved it.

Tested x86_64-pc-linux-gnu, applying to trunk.  Will also apply to 4.6.2 
once branch unfreezes.
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