[C++ Patch] More accurate location for conditional expressions

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,

a little more work on locations. Yesterday, when I patched 
build_new_op_1 to propagate the incoming location to cp_build_binary_op 
I noticed that the locations for the conditional expressions in 
Wdouble-promotion.C where inaccurate, essentially always pointing to the 
end. We can improve the situation by adding a location_t parameter to 
build_conditional_expr and using it from build_x_conditional_expr. I'm 
also happy about the error message we get for cpp0x/explicit3.C: we used 
to also print spurious lines of code when printing notes about built-ins 
(eg, for line #44).

Tested x86_64-linux.

Thanks,
Paolo.

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