Add 'previous declaration is here' note for param redefinition 
errors, e.g.:

t.c:1:21: error: redefinition of parameter 'x'
int test(int x, int x);
                    ^
t.c:1:14: note: previous declaration is here
int test(int x, int x);
             ^



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@96769 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed