Update cvinfo.h

[bfiete]

@AndrewPardoe
There appear to be some undocumented additions in VS2019 that are not covered in cvinfo.h

Known undocumented nodes:
Leaf 0x1609
Sym 0x1167 (S_FASTLINK)
Sym 0x1168 (S_INLINEES)
Sym 0x1176
Sym 0x1179

Tools such as llvm-pdbutil are unable to parse pdb files containing those undocumented nodes. Would it be possible to update cvinfo.h?

[avakar]

The 0x1609 leaf seems to be LF_STRUCT but with property extended to 32-bits and some field realignment. I'd guess that member count is now encoded in the same way as structure length.

struct lfClass2 {
    unsigned short  leaf;           // LF_CLASS, LF_STRUCT, LF_INTERFACE
    CV_prop32_t       property;       // property attribute field (prop_t)
    CV_typ_t        field;          // type index of LF_FIELD descriptor list
    CV_typ_t        derived;        // type index of derived from list if not zero
    CV_typ_t        vshape;         // type index of vshape table for this class

    varint count;
    varint length;
    string name;
    string mangled_name;
};