RustWrapper: adapt for an LLVM API change

No functional changes intended.

The LLVM commit
llvm/llvm-project@89b5706
moved TargetRegistry.(h|cpp) from Support to MC.
This adapts RustWrapper accordingly.

Author: krasimirgg

Diff for: compiler/rustc_llvm/llvm-wrapper/LLVMWrapper.h

@@ -18,7 +18,6 @@
 #include "llvm/Support/Host.h"
 #include "llvm/Support/Memory.h"
 #include "llvm/Support/SourceMgr.h"
-#include "llvm/Support/TargetRegistry.h"
 #include "llvm/Support/TargetSelect.h"
 #include "llvm/Support/Timer.h"
 #include "llvm/Support/raw_ostream.h"

Diff for: compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp

@@ -21,6 +21,11 @@
 #include "llvm/Support/CBindingWrapping.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Host.h"
+#if LLVM_VERSION_LT(14, 0)
+#include "llvm/Support/TargetRegistry.h"
+#else
+#include "llvm/MC/TargetRegistry.h"
+#endif
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Transforms/IPO/PassManagerBuilder.h"
 #include "llvm/Transforms/IPO/AlwaysInliner.h"