[lldb] Implement thread local storage for linux (#67470)

This patch implements the thread local storage support for linux
(https://github.com/llvm/llvm-project/issues/28766).

TLS feature is originally only implemented for Mac. With my previous
patch to enable `fs_base` register for Linux
(https://reviews.llvm.org/D155256), now it is feasible to implement this
feature for Linux.

The major changes are:
* Track the main module's link address during launch
* Fetch thread pointer from `fs_base` register
* Create register alias for thread pointer
* Read pthread metadata from target memory instead of process so that it
works for coredump

With the patch the failing test is passing now. Note: I am only enabling
this test for Mac and Linux because I do not have machine to test for
FreeBSD/NetBSD.

---------

Co-authored-by: jeffreytan81 <jeffreytan@fb.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
index 65c7a0f..23c2f18 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
@@ -595,6 +595,8 @@ static llvm::StringRef GetKindGenericOrEmpty(const RegisterInfo &reg_info) {
     return "arg7";
   case LLDB_REGNUM_GENERIC_ARG8:
     return "arg8";
+  case LLDB_REGNUM_GENERIC_TP:
+    return "tp";
   default:
     return "";
   }