[ubsan] PR34266: When sanitizing the 'this' value for a member function that happens...

[ubsan] PR34266: When sanitizing the 'this' value for a member function that happens to be a lambda call operator, use the lambda's 'this' pointer, not the captured enclosing 'this' pointer (if any).

Do not sanitize the 'this' pointer of a member call operator for a lambda with
no capture-default, since that call operator can legitimately be called with a
null this pointer from the static invoker function. Any actual call with a null
this pointer should still be caught in the caller (if it is being sanitized).

This reinstates r311589 (reverted in r311680) with the above fix.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@311695 91177308-0d34-0410-b5e6-96231b3b80d8