Revert "[SymbolFilePDB] Fix null array access when parsing the type of a function...

Revert "[SymbolFilePDB] Fix null array access when parsing the type of a function without any arguments, i.e. 'int main()' and add support to test it"

This reverts commit r322995, as it breaks
lldb-Unit::SymbolFilePDBTests.TestTypedefs
<http://lab.llvm.org:8011/builders/lldb-windows7-android/builds/7715>.

llvm-svn: 323102