[clang-format] Break template declarations followed by comments

Summary:
This patch fixes two bugs in clang-format where the template wrapper doesn't skip over
comments causing a long template declaration to not be split into multiple lines.
These were latent and exposed by r332436.

Reviewers: sammccall

Reviewed By: sammccall

Subscribers: klimek, cfe-commits

Differential Revision: https://reviews.llvm.org/D47257

llvm-svn: 333085
diff --git a/clang/lib/Format/ContinuationIndenter.cpp b/clang/lib/Format/ContinuationIndenter.cpp
index 441df05..eacdfdc 100644
--- a/clang/lib/Format/ContinuationIndenter.cpp
+++ b/clang/lib/Format/ContinuationIndenter.cpp
@@ -405,7 +405,7 @@
   // If the template declaration spans multiple lines, force wrap before the
   // function/class declaration
   if (Previous.ClosesTemplateDeclaration &&
-      State.Stack.back().BreakBeforeParameter)
+      State.Stack.back().BreakBeforeParameter && Current.CanBreakBefore)
     return true;
 
   if (State.Column <= NewLineColumn)
@@ -804,7 +804,8 @@
        !State.Stack.back().AvoidBinPacking) ||
       Previous.is(TT_BinaryOperator))
     State.Stack.back().BreakBeforeParameter = false;
-  if (Previous.isOneOf(TT_TemplateCloser, TT_JavaAnnotation) &&
+  if (PreviousNonComment &&
+      PreviousNonComment->isOneOf(TT_TemplateCloser, TT_JavaAnnotation) &&
       Current.NestingLevel == 0)
     State.Stack.back().BreakBeforeParameter = false;
   if (NextNonComment->is(tok::question) ||