[clang-format] treat 'lock' as a keyword for C# code

[jbcoe]

Summary

This will put a space in lock (process) when spaces are required after keywords.

clang/lib/Format/TokenAnnotator.cpp

if (Left.is(TT_CSharpNullConditionalLSquare))
       return Style.SpacesInSquareBrackets;
 
     // space after var in `var (key, value)`
     if (Left.is(Keywords.kw_var) && Right.is(tok::l_paren))
       return true;
 
     // space between keywords and paren e.g. "using ("
     if (Right.is(tok::l_paren))
-      if (Left.isOneOf(tok::kw_using, Keywords.kw_async, Keywords.kw_when))
+      if (Left.isOneOf(tok::kw_using, Keywords.kw_async, Keywords.kw_when,
+                       Keywords.kw_lock))
         return Style.SpaceBeforeParens == FormatStyle::SBPO_ControlStatements ||
                spaceRequiredBeforeParens(Right);
   } else if (Style.Language == FormatStyle::LK_JavaScript) {
     if (Left.is(TT_JsFatArrow))
       return true;
     // for await ( ...
     if (Right.is(tok::l_paren) && Left.is(Keywords.kw_await) && Left.Previous &&
         Left.Previous->is(tok::kw_for))

clang/unittests/Format/FormatTestCSharp.cpp

TEST_F(FormatTestCSharp, CSharpSpaces) {
   verifyFormat(R"(A == typeof(X) && someBool)", Style);
 
   // Not seen as a C-style cast.
   verifyFormat(R"(//
 foreach ((A a, B b) in someList) {
 })",
                Style);
 
+  // space after lock in `lock (processes)`.
+  verifyFormat("lock (process)", Style);
+
   Style.SpacesInSquareBrackets = true;
   verifyFormat(R"(private float[ , ] Values;)", Style);
   verifyFormat(R"(string dirPath = args?[ 0 ];)", Style);
   verifyFormat(R"(char[ ,, ] rawCharArray = MakeCharacterGrid();)", Style);
 }
 
 TEST_F(FormatTestCSharp, CSharpNullableTypes) {
   FormatStyle Style = getGoogleStyle(FormatStyle::LK_CSharp);