Warn when the conversion of an integral non-type template argument to

the type of its corresponding non-type template parameter changes the
value. Previously, we were diagnosing this as an error, which was
wrong. We give reasonably nice warnings like:

test/SemaTemplate/temp_arg_nontype.cpp:100:10: warning: non-type template
      argument value '256' truncated to '0' for template parameter of type
      'unsigned char'
Overflow<256> *overflow3; // expected-warning{{non-type template ...
         ^~~
test/SemaTemplate/temp_arg_nontype.cpp:96:24: note: template parameter is
      declared here
template<unsigned char C> struct Overflow;
                       ^



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@99561 91177308-0d34-0410-b5e6-96231b3b80d8

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