Revert "Reland "[lldb][DWARFASTParserClang] Attach linkage name to ctors/dtors if missing""

This reverts commit 19128792.

As pointed out in https://reviews.llvm.org/D143652 this implementation
doesn't quite work for subobject constructors/destructors because DWARF
can map multiple definitions of a ctor/dtor to the same specification DIE.
With the current implementation we would pick the first definition we
find and use that linkage name which means we can sometimes pick the
wrong dtor/ctor and fail to execute a valid expression.

Differential Revision: https://reviews.llvm.org/D143652