[clang][OpenMP] Fix bug #62099 - use hash value when inode ID cannot be determined (#131646)

When creating the name of an outlined region, Clang uses the file's
inode ID to generate a unique name. When the file does not exist, this
causes a fatal abort of the compiler. This PR switches to a has value
that is used instead.

---------

Co-authored-by: Michael Kruse <[email protected]>

Author: mjklemm

llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp

@@ -9539,14 +9539,16 @@ OpenMPIRBuilder::getTargetEntryUniqueInfo(FileIdentifierInfoCallbackTy CallBack,
                                           StringRef ParentName) {
   sys::fs::UniqueID ID;
   auto FileIDInfo = CallBack();
-  if (auto EC = sys::fs::getUniqueID(std::get<0>(FileIDInfo), ID)) {
-    report_fatal_error(("Unable to get unique ID for file, during "
-                        "getTargetEntryUniqueInfo, error message: " +
-                        EC.message())
-                           .c_str());
-  }
+  uint64_t FileID = 0;
+  std::error_code EC = sys::fs::getUniqueID(std::get<0>(FileIDInfo), ID);
+  // If the inode ID could not be determined, create a hash value
+  // the current file name and use that as an ID.
+  if (EC)
+    FileID = hash_value(std::get<0>(FileIDInfo));
+  else
+    FileID = ID.getFile();
 
-  return TargetRegionEntryInfo(ParentName, ID.getDevice(), ID.getFile(),
+  return TargetRegionEntryInfo(ParentName, ID.getDevice(), FileID,
                                std::get<1>(FileIDInfo));
 }