[MLIR] Add missing MLIRLLVMDialect dep to MLIRMathToLibm (llvm#113563)

This fixes the following failure when doing a clean build (in particular
no .ninja* lying around) of lib/libMLIRMathToLibm.a only:
```
In file included from llvm/include/llvm/IR/Module.h:22,
                 from mlir/include/mlir/Dialect/LLVMIR/LLVMDialect.h:37,
                 from mlir/lib/Conversion/MathToLibm/MathToLibm.cpp:13
llvm/include/llvm/IR/Attributes.h:90:14: fatal error: llvm/IR/Attributes.inc: No such file or directory
```

Author: RoboTux

mlir/lib/Conversion/MathToLibm/CMakeLists.txt

@@ -14,6 +14,7 @@ add_mlir_conversion_library(MLIRMathToLibm
   MLIRArithDialect
   MLIRDialectUtils
   MLIRFuncDialect
+  MLIRLLVMDialect
   MLIRMathDialect
   MLIRPass
   MLIRTransformUtils