Fix for GetName() (#61)

Need to access process/main-thread name from psinfo on aix rather than comm on linux.

(0) root @ unobosdev002: /home/dhruv/dio_fs/LLDB/build-lldb
# bin/lldb ../tests/1
(lldb) target create "../tests/1"
Current executable set to '/home/dhruv/dio_fs/LLDB/tests/1' (powerpc64).
(lldb) b main
Breakpoint 1: where = 1`main + 8 at 1.c:3, address = 0x0000000100000928
(lldb) r
Process 44433678 launched: '/home/dhruv/dio_fs/LLDB/tests/1' (powerpc64)
Process 44433678 stopped
* thread #1, name = '1', stop reason = breakpoint 1.1
    frame #0: 0x0000000100000928 1`main at 1.c:3
   1    int main()
   2    {
-> 3        int x = 10;
   4        x++;
   5        return x;
   6    }
(lldb) thread info
thread #1: tid = 0x2a6010e, 0x0000000100000928 1`main at 1.c:3, name = '1', stop reason = breakpoint 1.1

Author: DhruvSrivastavaX

lldb/source/Plugins/Process/AIX/NativeThreadAIX.cpp

@@ -24,7 +24,8 @@
 #include "llvm/ADT/SmallString.h"
 
 #include "Plugins/Process/POSIX/CrashReason.h"
-
+#include <procinfo.h>
+#include <sys/procfs.h>
 #include <sys/types.h>
 #include <sys/ptrace.h>
 #include <signal.h>
@@ -102,11 +103,15 @@ NativeThreadAIX::NativeThreadAIX(NativeProcessAIX &process,
 
 std::string NativeThreadAIX::GetName() {
   NativeProcessAIX &process = GetProcess();
-
-  auto BufferOrError = getProcFile(process.GetID(), GetID(), "comm");
+  auto BufferOrError = getProcFile(process.GetID(), "psinfo");
   if (!BufferOrError)
     return "";
-  return std::string(BufferOrError.get()->getBuffer().rtrim('\n'));
+  auto &Buffer = *BufferOrError;
+  if (Buffer->getBufferSize() < sizeof(psinfo_t))
+    return "";
+  const psinfo_t *psinfo =
+      reinterpret_cast<const psinfo_t *>(Buffer->getBufferStart());
+  return std::string(psinfo->pr_fname);
 }
 
 lldb::StateType NativeThreadAIX::GetState() { return m_state; }