C++ PATCHes to build_vec_init for c++/61994

[Jason Merrill]

The first patch is a simple fix for the testcase in 61994: if we build 
an INIT_EXPR, it should have array type, not pointer type.

But looking at that bug, I noticed a wrong-code bug as well: in cases 
like the testcase in 61994 where all the initializers are constant, we 
were failing to initialize trailing elements (with no explicit 
initializer) in cases where value-initialization is different from 
zero-initialization.  Oops.  So the second patch fixes that.

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