Add support for shared library load when executable called through ld.
Currently, when an executable is called like: ld-linux --library-path <path> executable, lldb is not able to load the shared libraries needed by the executable provided by library-path. lldb is not able to set Rendezvous breakpoint in this case.
This patch adds the support to enable setting rendezvous breakpoint when called using ld-*.so. It enables it to hit the breakpoint and extract the address of the rendezvous structure, which is how lldb is now able to load the shared libraries.
Inline contents of ObjectFileELF::GetRendezvousStructureAddress(...) to here. We already have the object file we need, so we can just extract the symbol from here.
I had started to try and fix this as well a few weeks ago, and I used Module::FindFirstSymbolWithNameAndType(...) to avoid having to get multiple results back: