s/LLVM_ON_WIN32/_WIN32/, lldb
                                                                                
LLVM_ON_WIN32 is set exactly with MSVC and MinGW (but not Cygwin) in            
HandleLLVMOptions.cmake, which is where _WIN32 defined too.  Just use the        
default macro instead of a reinvented one.                                      
                                                                                
See thread "Replacing LLVM_ON_WIN32 with just _WIN32" on llvm-dev and cfe-dev.  
No intended behavior change.

llvm-svn: 329697
diff --git a/lldb/source/Core/Debugger.cpp b/lldb/source/Core/Debugger.cpp
index 172cd48..824b2af 100644
--- a/lldb/source/Core/Debugger.cpp
+++ b/lldb/source/Core/Debugger.cpp
@@ -48,7 +48,7 @@
 #include "lldb/Utility/StreamCallback.h"
 #include "lldb/Utility/StreamString.h"
 
-#if defined(LLVM_ON_WIN32)
+#if defined(_WIN32)
 #include "lldb/Host/windows/PosixApi.h" // for PATH_MAX
 #endif
 
diff --git a/lldb/source/Core/Module.cpp b/lldb/source/Core/Module.cpp
index 39d7c62..35be294 100644
--- a/lldb/source/Core/Module.cpp
+++ b/lldb/source/Core/Module.cpp
@@ -46,7 +46,7 @@
 #include "lldb/Utility/StreamString.h"
 #include "lldb/Utility/Timer.h"
 
-#if defined(LLVM_ON_WIN32)
+#if defined(_WIN32)
 #include "lldb/Host/windows/PosixApi.h" // for PATH_MAX
 #endif
 
diff --git a/lldb/source/Core/ModuleList.cpp b/lldb/source/Core/ModuleList.cpp
index 4c99bbc..6d7f450 100644
--- a/lldb/source/Core/ModuleList.cpp
+++ b/lldb/source/Core/ModuleList.cpp
@@ -26,7 +26,7 @@
 #include "lldb/Utility/UUID.h"    // for UUID, operator!=, operator==
 #include "lldb/lldb-defines.h"    // for LLDB_INVALID_INDEX32
 
-#if defined(LLVM_ON_WIN32)
+#if defined(_WIN32)
 #include "lldb/Host/windows/PosixApi.h" // for PATH_MAX
 #endif
 
diff --git a/lldb/source/Core/PluginManager.cpp b/lldb/source/Core/PluginManager.cpp
index a49fbc3..1f02b40 100644
--- a/lldb/source/Core/PluginManager.cpp
+++ b/lldb/source/Core/PluginManager.cpp
@@ -17,7 +17,7 @@
 #include "lldb/Utility/Status.h"
 #include "lldb/Utility/StringList.h" // for StringList
 
-#if defined(LLVM_ON_WIN32)
+#if defined(_WIN32)
 #include "lldb/Host/windows/PosixApi.h" // for PATH_MAX
 #endif