Add missing StringExtras.h includes

In preparation for removing the `#include "llvm/ADT/StringExtras.h"`
from the header to source file of `llvm/Support/Error.h`, first add in
all the missing includes that were previously included transitively
through this header.

This is fixing all files missed in b0abd48 and
39d8e6e.

Differential Revision: https://reviews.llvm.org/D154763

lldb/source/Host/common/File.cpp

@@ -31,6 +31,7 @@
 #include "lldb/Utility/FileSpec.h"
 #include "lldb/Utility/Log.h"
 #include "lldb/Utility/VASPrintf.h"
+#include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/ConvertUTF.h"
 #include "llvm/Support/Errno.h"
 #include "llvm/Support/FileSystem.h"

lldb/source/Host/common/Socket.cpp

@@ -17,6 +17,7 @@
 #include "lldb/Utility/Log.h"
 
 #include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/Errno.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/Regex.h"

lldb/source/Host/common/XML.cpp

@@ -9,6 +9,8 @@
 #include "lldb/Host/Config.h"
 #include "lldb/Host/XML.h"
 
+#include "llvm/ADT/StringExtras.h"
+
 using namespace lldb;
 using namespace lldb_private;
 

llvm/lib/WindowsDriver/MSVCPaths.cpp

@@ -9,6 +9,7 @@
 #include "llvm/WindowsDriver/MSVCPaths.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Support/Path.h"

openmp/libomptarget/src/omptarget.cpp

@@ -16,6 +16,7 @@
 #include "private.h"
 #include "rtl.h"
 
+#include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/bit.h"
 
 #include <cassert>