fix trivial typos in comments; NFC

llvm-svn: 306969
diff --git a/clang/lib/Parse/ParseExpr.cpp b/clang/lib/Parse/ParseExpr.cpp
index aacb00e..44b87af 100644
--- a/clang/lib/Parse/ParseExpr.cpp
+++ b/clang/lib/Parse/ParseExpr.cpp
@@ -1866,7 +1866,7 @@
     }
   }
 
-  // If we get here, the operand to the typeof/sizeof/alignof was an expresion.
+  // If we get here, the operand to the typeof/sizeof/alignof was an expression.
   isCastExpr = false;
   return Operand;
 }
@@ -1972,7 +1972,7 @@
   if (OpTok.isOneOf(tok::kw_alignof, tok::kw__Alignof))
     Diag(OpTok, diag::ext_alignof_expr) << OpTok.getIdentifierInfo();
 
-  // If we get here, the operand to the sizeof/alignof was an expresion.
+  // If we get here, the operand to the sizeof/alignof was an expression.
   if (!Operand.isInvalid())
     Operand = Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(),
                                                     ExprKind,