[demangler] Add getters for Qual/Vector/Pointer types

These are useful for downstream tool aligning the mangling of data types which differ between different languages/targets.

Patch by Steffen Larsen <steffen.larsen@intel.com>

Differential Revision: https://reviews.llvm.org/D130909

GitOrigin-RevId: f0f1bcadc74fa5cd11a118673340ca3e9a8c0037
1 file changed