[clang] [clang-format] Option to ignore PP directives (PR #70338)

[Björn Schäpers via cfe-commits]

================
@@ -1134,6 +1134,14 @@ void UnwrappedLineParser::parsePPDefine() {
     return;
   }
 
+  if (Style.IgnorePPDefinitions) {
+    do {
+      nextToken();
+    } while (!eof());
----------------
HazardyKnusperkeks wrote:

I assume you have tested this on real code. Can you explain why it is okay to 
check for `eof()`? I really don't know this code, and am a bit surprised.

https://github.com/llvm/llvm-project/pull/70338
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