perf clang: Fix header include for LLVM >= 14

The header TargetRegistry.h has moved in LLVM/clang 14.

Committer notes:

The problem as noticed when building in ubuntu:22.04:

90 98.61 ubuntu:22.04 : FAIL gcc version 11.2.0 (Ubuntu 11.2.0-19ubuntu1)
util/c++/clang.cpp:23:10: fatal error: llvm/Support/TargetRegistry.h: No such file or directory
23 | #include "llvm/Support/TargetRegistry.h"
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

Fixed after applying this patch.

Reported-by: Arnaldo Carvalho de Melo <[e-mail]>
Signed-off-by: Guilherme Amadio <[e-mail]>
Tested-by: Arnaldo Carvalho de Melo <[e-mail]>
Link: https://twitter.com/GuilhermeAmadio/status/1514970524232921088
Link: http://lore.kernel.org/lkml/Ylp0M/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/c++/clang.cpp

···
 #include "llvm/Option/Option.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/ManagedStatic.h"
+#if CLANG_VERSION_MAJOR >= 14
+#include "llvm/MC/TargetRegistry.h"
+#else
 #include "llvm/Support/TargetRegistry.h"
+#endif
 #include "llvm/Support/TargetSelect.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetOptions.h"