[mlir] Partially revert #162903

[jansvoboda11]

With #163862, this is not really necessary and causes downstream issues.

[llvmbot]

@llvm/pr-subscribers-mlir-core

@llvm/pr-subscribers-mlir

Author: Jan Svoboda (jansvoboda11)

Changes

With #163862, this is not really necessary and causes downstream issues.

---

Full diff: https://github.com/llvm/llvm-project/pull/164464.diff

1 Files Affected:

• (modified) mlir/lib/IR/Diagnostics.cpp (+2-4)

diff --git a/mlir/lib/IR/Diagnostics.cpp b/mlir/lib/IR/Diagnostics.cpp
index 4d819188fa555..776b5c6588c71 100644
--- a/mlir/lib/IR/Diagnostics.cpp
+++ b/mlir/lib/IR/Diagnostics.cpp
@@ -378,10 +378,8 @@ struct SourceMgrDiagnosticHandlerImpl {
     }
 
     // Otherwise, try to load the source file.
-    auto bufferOrErr = llvm::MemoryBuffer::getFile(filename);
-    if (!bufferOrErr)
-      return 0;
-    unsigned id = mgr.AddNewSourceBuffer(std::move(*bufferOrErr), SMLoc());
+    std::string ignored;
+    unsigned id = mgr.AddIncludeFile(std::string(filename), SMLoc(), ignored);
     filenameToBufId[filename] = id;
     return id;
   }

[uenoku]

Thank you for the quick fix!