[lldb] Add a getter for the process' system architecture

This patch adds a getter for the process' system architecture. I went
with Process::GetSystemArchitecture to match
Platform::GetSystemArchitecture.

Differential revision: https://reviews.llvm.org/D121443

Author: JDevlieghere

lldb/include/lldb/Target/Process.h

@@ -696,6 +696,9 @@ class Process : public std::enable_shared_from_this<Process>,
   virtual JITLoaderList &GetJITLoaders();
 
 public:
+  /// Get the system architecture for this process.
+  virtual ArchSpec GetSystemArchitecture() { return {}; }
+
   /// Get the system runtime plug-in for this process.
   ///
   /// \return

lldb/source/Plugins/Process/Windows/Common/ProcessWindows.cpp

@@ -576,6 +576,10 @@ bool ProcessWindows::IsAlive() {
   }
 }
 
+ArchSpec ProcessWindows::GetSystemArchitecture() {
+  return HostInfo::GetArchitecture();
+}
+
 size_t ProcessWindows::DoReadMemory(lldb::addr_t vm_addr, void *buf,
                                     size_t size, Status &error) {
   size_t bytes_read = 0;

lldb/source/Plugins/Process/Windows/Common/ProcessWindows.h

@@ -71,6 +71,8 @@ class ProcessWindows : public Process, public ProcessDebugger {
                           ThreadList &new_thread_list) override;
   bool IsAlive() override;
 
+  ArchSpec GetSystemArchitecture override();
+
   size_t DoReadMemory(lldb::addr_t vm_addr, void *buf, size_t size,
                       Status &error) override;
   size_t DoWriteMemory(lldb::addr_t vm_addr, const void *buf, size_t size,

lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp

@@ -208,6 +208,10 @@ std::chrono::seconds ProcessGDBRemote::GetPacketTimeout() {
   return std::chrono::seconds(GetGlobalPluginProperties().GetPacketTimeout());
 }
 
+ArchSpec ProcessGDBRemote::GetSystemArchitecture() {
+  return m_gdb_comm.GetHostArchitecture();
+}
+
 bool ProcessGDBRemote::CanDebug(lldb::TargetSP target_sp,
                                 bool plugin_specified_by_name) {
   if (plugin_specified_by_name)

lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.h

@@ -70,6 +70,8 @@ class ProcessGDBRemote : public Process,
 
   static std::chrono::seconds GetPacketTimeout();
 
+  ArchSpec GetSystemArchitecture() override;
+
   // Check if a given Process
   bool CanDebug(lldb::TargetSP target_sp,
                 bool plugin_specified_by_name) override;