Introduce CGFunctionInfo::getNumRequiredArgs(). NFC.

Save the callers from necessity to special-case on variadic functions.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@218625 91177308-0d34-0410-b5e6-96231b3b80d8
AST: Fix a typo in RecordLayoutBuilder

No functional change intended.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@218628 91177308-0d34-0410-b5e6-96231b3b80d8