[clang-tidy] Install run-clang-tidy.py in bin/ as run-clang-tidy

The run-clang-tidy.py helper script is supposed to be used by the
user, hence it should be placed in the user's PATH. Some
distributions, like Gentoo [1], won't have it in PATH unless it is
installed in bin/.

Furthermore, installed scripts in PATH usually do not carry a filename
extension, since there is no need to know that this is a Python
script. For example Debian and Ubuntu already install this script as
'run-clang-tidy' [2] and hence build systems like Meson also look for
this name first [3]. Hence we install run-clang-tidy.py as
run-clang-tidy, as suggested by Sylvestre Ledru [4].

1: https://bugs.gentoo.org/753380
2: 60aefb1417/debian/clang-tidy-X.Y.links.in (L2)
3: b6dc4d5e5c/mesonbuild/scripts/clangtidy.py (L44)
4: https://reviews.llvm.org/D90972#2380640

Reviewed By: sylvestre.ledru, JonasToth

Differential Revision: https://reviews.llvm.org/D90972

clang-tools-extra/clang-tidy/tool/CMakeLists.txt

@@ -55,5 +55,6 @@ install(PROGRAMS clang-tidy-diff.py
   DESTINATION share/clang
   COMPONENT clang-tidy)
 install(PROGRAMS run-clang-tidy.py
-  DESTINATION share/clang
-  COMPONENT clang-tidy)
+  DESTINATION bin
+  COMPONENT clang-tidy
+  RENAME run-clang-tidy)

clang-tools-extra/docs/ReleaseNotes.rst

@@ -67,6 +67,9 @@ The improvements are...
 Improvements to clang-tidy
 --------------------------
 
+- The `run-clang-tidy.py` helper script is now installed in `bin/` as
+  `run-clang-tidy`. It was previously installed in `share/clang/`.
+
 New checks
 ^^^^^^^^^^