[lldb] fix crash on FreeBSD/powerpc64le (llvm#138331)

Fix for:
`Assertion failed: (false && "Architecture or OS not supported"),
function CreateRegisterContextForFrame, file
/usr/src/contrib/llvm-project/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp,
line 182.
PLEASE submit a bug report to https://bugs.freebsd.org/submit/ and
include the crash backtrace.
#0 0x000000080cd857c8 llvm::sys::PrintStackTrace(llvm::raw_ostream&,
int)
/usr/src/contrib/llvm-project/llvm/lib/Support/Unix/Signals.inc:723:13
#1 0x000000080cd85ed4
/usr/src/contrib/llvm-project/llvm/lib/Support/Unix/Signals.inc:797:3
#2 0x000000080cd82ae8 llvm::sys::RunSignalHandlers()
/usr/src/contrib/llvm-project/llvm/lib/Support/Signals.cpp:104:5
#3 0x000000080cd861f0 SignalHandler
/usr/src/contrib/llvm-project/llvm/lib/Support/Unix/Signals.inc:403:3 llvm#4
0x000000080f159644 handle_signal
/usr/src/lib/libthr/thread/thr_sig.c:298:3
`

Author: pkubaj

lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp

@@ -95,6 +95,7 @@ ThreadElfCore::CreateRegisterContextForFrame(StackFrame *frame) {
         reg_interface = new RegisterContextFreeBSD_powerpc32(arch);
         break;
       case llvm::Triple::ppc64:
+      case llvm::Triple::ppc64le:
         reg_interface = new RegisterContextFreeBSD_powerpc64(arch);
         break;
       case llvm::Triple::mips64: