Fix crash on invalid.

if { foo; }
would previously crash clang-format.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172232 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Format/UnwrappedLineParser.cpp b/lib/Format/UnwrappedLineParser.cpp
index 758f819..07ad7a7 100644
--- a/lib/Format/UnwrappedLineParser.cpp
+++ b/lib/Format/UnwrappedLineParser.cpp
@@ -404,7 +404,8 @@
 void UnwrappedLineParser::parseIfThenElse() {
   assert(FormatTok.Tok.is(tok::kw_if) && "'if' expected");
   nextToken();
-  parseParens();
+  if (FormatTok.Tok.is(tok::l_paren))
+    parseParens();
   bool NeedsUnwrappedLine = false;
   if (FormatTok.Tok.is(tok::l_brace)) {
     parseBlock();