C++ PATCH for c++/49134 (constexpr failures on ARM)

[Jason Merrill]

build_target_expr was making the assumption that the initializer for a 
temporary should have the same type as the temporary, but that isn't the 
case on ARM, where the ABI is changed to return 'this' from 
constructors.  So I adjusted the assert.

Tested x86_64-pc-linux-gnu, applying to trunk and 4.6.
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