[llvm] [mlir] [mlir][nvvm] Add missing include to llvm-config.h. (PR #83998)

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Author: Ingo Müller (ingomueller-net)

<details>
<summary>Changes</summary>

This is another follow-up of #<!-- -->83004. `NVVM/Target.cpp` uses the macro `MLIR_NVPTXCOMPILER_ENABLED`, which is defined in `llvm-config.h` but did not include that file, yielding a warning when compiled with `-Wundef`. This PR adds the include.

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Full diff: https://github.com/llvm/llvm-project/pull/83998.diff


2 Files Affected:

- (modified) mlir/lib/Target/LLVM/NVVM/Target.cpp (+1) 
- (modified) utils/bazel/llvm-project-overlay/mlir/BUILD.bazel (+1) 


``````````diff
diff --git a/mlir/lib/Target/LLVM/NVVM/Target.cpp b/mlir/lib/Target/LLVM/NVVM/Target.cpp
index d5b6645631edd6..e31df99ea20d6f 100644
--- a/mlir/lib/Target/LLVM/NVVM/Target.cpp
+++ b/mlir/lib/Target/LLVM/NVVM/Target.cpp
@@ -22,6 +22,7 @@
 #include "mlir/Target/LLVMIR/Dialect/NVVM/NVVMToLLVMIRTranslation.h"
 #include "mlir/Target/LLVMIR/Export.h"
 
+#include "llvm/Config/llvm-config.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/FileUtilities.h"
 #include "llvm/Support/FormatVariadic.h"
diff --git a/utils/bazel/llvm-project-overlay/mlir/BUILD.bazel b/utils/bazel/llvm-project-overlay/mlir/BUILD.bazel
index 8a8dd6e10c48aa..e917d310415f35 100644
--- a/utils/bazel/llvm-project-overlay/mlir/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/mlir/BUILD.bazel
@@ -6182,6 +6182,7 @@ cc_library(
         ":config",
         "//llvm:NVPTXCodeGen",
         "//llvm:Support",
+        "//llvm:config",
     ],
 )
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/83998