Fix spelling mistake.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@285938 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 398d04c1ebdd8d9f5fdf3690c288106ee87bbc99)
diff --git a/lib/Sema/SemaTemplateInstantiate.cpp b/lib/Sema/SemaTemplateInstantiate.cpp
index cf71c15..e7b221d 100644
--- a/lib/Sema/SemaTemplateInstantiate.cpp
+++ b/lib/Sema/SemaTemplateInstantiate.cpp
@@ -210,7 +210,7 @@
     : SemaRef(SemaRef), SavedInNonInstantiationSFINAEContext(
                             SemaRef.InNonInstantiationSFINAEContext) {
   // Don't allow further instantiation if a fatal error and an uncompilable
-  // error have occcured. Any diagnostics we might have raised will not be
+  // error have occurred. Any diagnostics we might have raised will not be
   // visible, and we do not need to construct a correct AST.
   if (SemaRef.Diags.hasFatalErrorOccurred() &&
       SemaRef.Diags.hasUncompilableErrorOccurred()) {