C++ PATCH for c++/44160 (__func__ and lambda)

[Jason Merrill]

Here since we hadn't called begin_compound_stmt yet for the simple 
return case, __func__ couldn't find a block scope to push into.  So we 
open-code cp_parser_function_body and share the code between the two cases.

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