Fix missing data in GetProcessInfo on linux

[tberghammer]

Summary

Fix missing data in GetProcessInfo on linux

Fill in the missing part of the architecture in GetProcessInfo from the HostArchitecture (e.g. Environment).

[ovyalov]

LGTM

[vharron]

Should ProcessInfo.GetArchitecture be const like Target?

http://reviews.llvm.org/D8287

[tberghammer]

In D8292#139808, @vharron wrote:

Should ProcessInfo.GetArchitecture be const like Target?

http://reviews.llvm.org/D8287

ProcessInfo.SetArchitecture don't have any logic inside it what would make it necessary.
It is possible to make it const (remove the non const version) but it would require some effort as it is used as non-const several places in the code and a simple rewrite would imply a small performance penalty also (doesn't matter here, but can matter in other places).

lldb/trunk/source/Host/linux/Host.cpp

 // C++ Includes
 // Other libraries and framework includes
 // Project includes
 #include "lldb/Core/Error.h"
 #include "lldb/Core/Log.h"
 #include "lldb/Target/Process.h"
 
 #include "lldb/Host/Host.h"
+#include "lldb/Host/HostInfo.h"
 #ifdef __ANDROID_NDK__
 #include "lldb/Host/android/Android.h"
 #endif
 #include "lldb/Core/DataBufferHeap.h"
 #include "lldb/Core/DataExtractor.h"
 
 #include "lldb/Core/ModuleSpec.h"
 #include "lldb/Symbol/ObjectFile.h"
GetProcessAndStatInfo (lldb::pid_t pid, ProcessInstanceInfo &process_info, ProcessStatInfo &stat_info, lldb::pid_t &tracerpid)
     }
     else
     {
         GetELFProcessCPUType (exe_path, process_info);
     }
 
     process_info.SetProcessID(pid);
     process_info.GetExecutableFile().SetFile(exe_path, false);
+    process_info.GetArchitecture().MergeFrom(HostInfo::GetArchitecture());
 
     lldb::DataBufferSP buf_sp;
 
     // Get the process environment.
     buf_sp = ProcFileReader::ReadIntoDataBuffer(pid, "environ");
     Args &info_env = process_info.GetEnvironmentEntries();
     char *next_var = (char *)buf_sp->GetBytes();
     char *end_buf = next_var + buf_sp->GetByteSize();