[llvm] Added keyword #undef to llvm-tblgen and fixed a small bug for llvm-tb… (PR #69093)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->

:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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git-clang-format --diff 0187960cdd0cc640317b29a2f25a0c30df3f68ef 2f4529974677a075290f5038d0e7df4d897a34c8 -- llvm/lib/TableGen/TGLexer.cpp llvm/lib/TableGen/TGLexer.h
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/TableGen/TGLexer.cpp b/llvm/lib/TableGen/TGLexer.cpp
index 87d3627f10ca..f00640dd13e3 100644
--- a/llvm/lib/TableGen/TGLexer.cpp
+++ b/llvm/lib/TableGen/TGLexer.cpp
@@ -12,8 +12,8 @@
 
 #include "TGLexer.h"
 #include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/StringSwitch.h"
 #include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/StringSwitch.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Config/config.h" // for strtoull()/strtoll() define
 #include "llvm/Support/Compiler.h"
@@ -36,14 +36,9 @@ namespace {
 struct {
   tgtok::TokKind Kind;
   const char *Word;
-} PreprocessorDirs[] = {
-  { tgtok::Ifdef, "ifdef" },
-  { tgtok::Ifndef, "ifndef" },
-  { tgtok::Else, "else" },
-  { tgtok::Endif, "endif" },
-  { tgtok::Define, "define" }, 
-  { tgtok::Undef, "undef"}
-};
+} PreprocessorDirs[] = {{tgtok::Ifdef, "ifdef"},   {tgtok::Ifndef, "ifndef"},
+                        {tgtok::Else, "else"},     {tgtok::Endif, "endif"},
+                        {tgtok::Define, "define"}, {tgtok::Undef, "undef"}};
 } // end anonymous namespace
 
 TGLexer::TGLexer(SourceMgr &SM, ArrayRef<std::string> Macros) : SrcMgr(SM) {
@@ -666,8 +661,7 @@ tgtok::TokKind TGLexer::prepIsDirective() const {
           // It looks like TableGen does not support '\r' as the actual
           // carriage return, e.g. getNextChar() treats a single '\r'
           // as '\n'.  So we do the same here.
-          NextChar == '\r' || 
-          NextChar == '\0')
+          NextChar == '\r' || NextChar == '\0')
         return Kind;
 
       // Allow comments after some directives, e.g.:
@@ -854,7 +848,7 @@ tgtok::TokKind TGLexer::lexPreprocessor(
       PrintFatalError("#undef must be ignored during the lines skipping");
       return tgtok::Error;
     }
-    
+
     return LexToken();
   }
 
diff --git a/llvm/lib/TableGen/TGLexer.h b/llvm/lib/TableGen/TGLexer.h
index 0b36249b4a57..02d141b629e1 100644
--- a/llvm/lib/TableGen/TGLexer.h
+++ b/llvm/lib/TableGen/TGLexer.h
@@ -72,7 +72,7 @@ enum TokKind {
   Else,
   Endif,
   Define,
-  Undef, 
+  Undef,
 
   // Reserved keywords. ('ElseKW' is named to distinguish it from the
   // existing 'Else' that means the preprocessor #else.)

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https://github.com/llvm/llvm-project/pull/69093