Move all sources from the llvm project into contrib/llvm-project.

This uses the new layout of the upstream repository, which was recently
migrated to GitHub, and converted into a "monorepo".  That is, most of
the earlier separate sub-projects with their own branches and tags were
consolidated into one top-level directory, and are now branched and
tagged together.

Updating the vendor area to match this layout is next.

1 files changed, 49 insertions, 0 deletions

diff --git a/contrib/llvm-project/llvm/lib/DebugInfo/CodeView/CodeViewError.cpp b/contrib/llvm-project/llvm/lib/DebugInfo/CodeView/CodeViewError.cpp
new file mode 100644
index 000000000000..69390c708f59
--- /dev/null
+++ b/contrib/llvm-project/llvm/lib/DebugInfo/CodeView/CodeViewError.cpp
@@ -0,0 +1,49 @@
+//===- CodeViewError.cpp - Error extensions for CodeView --------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/DebugInfo/CodeView/CodeViewError.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/ManagedStatic.h"
+
+using namespace llvm;
+using namespace llvm::codeview;
+
+namespace {
+// FIXME: This class is only here to support the transition to llvm::Error. It
+// will be removed once this transition is complete. Clients should prefer to
+// deal with the Error value directly, rather than converting to error_code.
+class CodeViewErrorCategory : public std::error_category {
+public:
+  const char *name() const noexcept override { return "llvm.codeview"; }
+  std::string message(int Condition) const override {
+    switch (static_cast<cv_error_code>(Condition)) {
+    case cv_error_code::unspecified:
+      return "An unknown CodeView error has occurred.";
+    case cv_error_code::insufficient_buffer:
+      return "The buffer is not large enough to read the requested number of "
+             "bytes.";
+    case cv_error_code::corrupt_record:
+      return "The CodeView record is corrupted.";
+    case cv_error_code::no_records:
+      return "There are no records.";
+    case cv_error_code::operation_unsupported:
+      return "The requested operation is not supported.";
+    case cv_error_code::unknown_member_record:
+      return "The member record is of an unknown type.";
+    }
+    llvm_unreachable("Unrecognized cv_error_code");
+  }
+};
+} // namespace
+
+static llvm::ManagedStatic<CodeViewErrorCategory> CodeViewErrCategory;
+const std::error_category &llvm::codeview::CVErrorCategory() {
+  return *CodeViewErrCategory;
+}
+
+char CodeViewError::ID;