Re-land: Make NativeExeSymbol a concrete subclass of NativeRawSymbol [PDB]

Re-land:  Make NativeExeSymbol a concrete subclass of NativeRawSymbol [PDB]

The new test should pass on all platforms now that llvm-pdbdump has the
`-color-output` option.

This moves exe symbol-specific method implementations out of NativeRawSymbol
into a concrete subclass. Also adds implementations for hasCTypes and
hasPrivateSymbols and a simple test to ensure the native reader can access
the summary information for the executable from the PDB.

Original Differential Revision: https://reviews.llvm.org/D31059

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@298623 91177308-0d34-0410-b5e6-96231b3b80d8