Replace HostInfo::GetLLDBPath with specific functions

Summary:
Instead of a function taking an enum value determining which path to
return, we now have a suite of functions, each returning a single path
kind. This makes it easy to move the python-path function into a
specific plugin in a follow-up commit.

All the users of GetLLDBPath were converted to call specific functions
instead. Most of them were hard-coding the enum value anyway, so this
conversion was simple. The only exception was SBHostOS, which I've
changed to use a switch on the incoming enum value.

Reviewers: clayborg, zturner

Subscribers: lldb-commits

Differential Revision: https://reviews.llvm.org/D48272

llvm-svn: 335052
diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerPlatform.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerPlatform.cpp
index 3e5cc56..26e28a9 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerPlatform.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerPlatform.cpp
@@ -534,7 +534,7 @@
     if (domainsocket_dir_env != nullptr)
       g_domainsocket_dir = FileSpec(domainsocket_dir_env, false);
     else
-      HostInfo::GetLLDBPath(ePathTypeLLDBTempSystemDir, g_domainsocket_dir);
+      g_domainsocket_dir = HostInfo::GetProcessTempDir();
   });
 
   return g_domainsocket_dir;