[TableGen] Fix indentation. NFC

llvm-svn: 238181
diff --git a/llvm/lib/TableGen/TableGenBackend.cpp b/llvm/lib/TableGen/TableGenBackend.cpp
index 8eea38a..b4a5318 100644
--- a/llvm/lib/TableGen/TableGenBackend.cpp
+++ b/llvm/lib/TableGen/TableGenBackend.cpp
@@ -23,7 +23,7 @@
                       StringRef Suffix) {
   size_t Pos = (size_t)OS.tell();
   assert((MAX_LINE_LEN - Prefix.str().size() - Suffix.size() > 0) &&
-    "header line exceeds max limit");
+         "header line exceeds max limit");
   OS << Prefix;
   const size_t e = MAX_LINE_LEN - Suffix.size();
   for (size_t i = (size_t)OS.tell() - Pos; i < e; ++i)