amd: Include missing llvm IR header Module.h

With LLVM-19, Module.h header is not being pulled, which results in
compile errors e.g.

src/amd/llvm/ac_llvm_helper.cpp:102:10: error: no matching function for call to ‘unwrap(LLVMOpaqueModule*&)’
  102 |    unwrap(module)->setTargetTriple(TM->getTargetTriple().getTriple());
      |    ~~~~~~^~~~~~~~
In file included from /mnt/b/yoe/master/build/tmp/work/x86_64-linux/mesa-native/24.0.7/recipe-sysroot-native/usr/include/llvm/IR/Type.h:18,
                 from /mnt/b/yoe/master/build/tmp/work/x86_64-linux/mesa-native/24.0.7/recipe-sysroot-native/usr/include/llvm/IR/DerivedTypes.h:23,
                 from /mnt/b/yoe/master/build/tmp/work/x86_64-linux/mesa-native/24.0.7/recipe-sysroot-native/usr/include/llvm/IR/InstrTypes.h:26,
                 from /mnt/b/yoe/master/build/tmp/work/x86_64-linux/mesa-native/24.0.7/recipe-sysroot-native/usr/include/llvm/Analysis/TargetLibraryInfo.h:14,
                 from ../mesa-24.0.7/src/amd/llvm/ac_llvm_helper.cpp:8:

Its getting the definition from llvm/IR/Type.h instead of Module.h and caused
confusion to compiler

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/11424

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29993>

src/amd/llvm/ac_llvm_helper.cpp

@@ -8,6 +8,7 @@
 #include <llvm/Analysis/TargetLibraryInfo.h>
 #include <llvm/IR/IRBuilder.h>
 #include <llvm/IR/LegacyPassManager.h>
+#include <llvm/IR/Module.h>
 #include <llvm/IR/Verifier.h>
 #include <llvm/Target/TargetMachine.h>
 #include <llvm/MC/MCSubtargetInfo.h>