C++ PATCH for c++/60361 (decl/expr ambiguity)

[Jason Merrill]

The problem in this testcase was that we were initially tentatively 
parsing int(A) as a parameter declaration, then complaining about using 
that parameter as a template-argument.  We should treat it as a parse 
error rather than a semantic error until we know how we really want to 
parse  things.

The second patch fixes the diagnostic location of the pedwarn about 
using list-initialization in C++98 mode.

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