Fix counting of parameters so that r175162 works as expected.

Before:
aaaaaaaaaaaaaaaaaaaaaaaa(aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa()
                              .aaaaaaaaaaaaaaaaa());

After:
aaaaaaaaaaaaaaaaaaaaaaaaa(
    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa().aaaaaaaaaaaaaaaaa());

Not sure which of the formattings above is better, but we should not pick
one by accident.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@175165 91177308-0d34-0410-b5e6-96231b3b80d8
Mangle extern "C" functions whose names are not simple identifiers.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@175166 91177308-0d34-0410-b5e6-96231b3b80d8