Revert "[Support] Move StringExtras.h include from Error.h to Error.cpp"

This reverts commit 2e2743b6479c9d90c85a0bf68d83d45c7f9f472d.

More transitive includes of `llvm/ADT/StringExtras.h` need to be
removed.

1 files changed, 0 insertions, 11 deletions

diff --git a/llvm/lib/Support/Error.cpp b/llvm/lib/Support/Error.cpp
index 21d5915..b339b70 100644
--- a/llvm/lib/Support/Error.cpp
+++ b/llvm/lib/Support/Error.cpp
@@ -7,8 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/Error.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Support/ErrorHandling.h"
 #include <system_error>
@@ -72,15 +70,6 @@ void logAllUnhandledErrors(Error E, raw_ostream &OS, Twine ErrorBanner) {
   });
 }
 
-/// Write all error messages (if any) in E to a string. The newline character
-/// is used to separate error messages.
-std::string toString(Error E) {
-  SmallVector<std::string, 2> Errors;
-  handleAllErrors(std::move(E), [&Errors](const ErrorInfoBase &EI) {
-    Errors.push_back(EI.message());
-  });
-  return join(Errors.begin(), Errors.end(), "\n");
-}
 
 std::error_code ErrorList::convertToErrorCode() const {
   return std::error_code(static_cast<int>(ErrorErrorCode::MultipleErrors),