Prune TargetInfo.h include from ParsedAttr.h, NFC
Saves ~400 includes of related headers:
$ diff -u <(sort thedeps-before.txt) <(sort thedeps-after.txt) \
| grep '^[-+] ' | sort | uniq -c | sort -nr
468 - llvm-project/clang/include/clang/Basic/TargetInfo.h
468 - llvm-project/clang/include/clang/Basic/TargetCXXABI.h
368 - llvm-project/llvm/include/llvm/Support/CodeGen.h
368 - llvm-project/clang/include/clang/Basic/XRayInstr.h
368 - llvm-project/clang/include/clang/Basic/CodeGenOptions.h
368 - llvm-project/clang/include/clang/Basic/CodeGenOptions.def
367 - llvm-project/llvm/include/llvm/ADT/FloatingPointMode.h
367 - llvm-project/clang/include/clang/Basic/DebugInfoOptions.h
17 files changed: