vim-patch:8.2.0141: no swift filetype detection (#11747)

Problem:    No swift filetype detection.
Solution:   Add swift, swiftgyb and sil. (Emir Sarı, closes vim/vim#5517)
0d76683e09

runtime/filetype.vim

@@ -1623,6 +1623,13 @@ au BufNewFile,BufRead *.sml			setf sml
 " Sratus VOS command macro
 au BufNewFile,BufRead *.cm			setf voscm
 
+" Swift
+au BufNewFile,BufRead *.swift			setf swift
+au BufNewFile,BufRead *.swift.gyb 		setf swiftgyb
+
+" Swift Intermediate Language
+au BufNewFile,BufRead *.sil 			setf sil
+
 " Sysctl
 au BufNewFile,BufRead */etc/sysctl.conf,*/etc/sysctl.d/*.conf	setf sysctl
 

src/nvim/testdir/test_filetype.vim

@@ -431,6 +431,9 @@ let s:filename_checks = {
     \ 'sudoers': ['any/etc/sudoers', 'sudoers.tmp'],
     \ 'svg': ['file.svg'],
     \ 'svn': ['svn-commitfile.tmp'],
+    \ 'swift': ['file.swift'],
+    \ 'swiftgyb': ['file.swift.gyb'],
+    \ 'sil': ['file.sil'],
     \ 'sysctl': ['/etc/sysctl.conf', '/etc/sysctl.d/file.conf'],
     \ 'systemd': ['any/systemd/file.automount', 'any/systemd/file.mount', 'any/systemd/file.path', 'any/systemd/file.service', 'any/systemd/file.socket', 'any/systemd/file.swap', 'any/systemd/file.target', 'any/systemd/file.timer', '/etc/systemd/system/some.d/file.conf', '/etc/systemd/system/some.d/.#file'],
     \ 'systemverilog': ['file.sv', 'file.svh'],