Fix a typo.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@224557 91177308-0d34-0410-b5e6-96231b3b80d8
Correct delayed typos in the operand to typeof expressions.

Fixes PR21947.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@224558 91177308-0d34-0410-b5e6-96231b3b80d8