During template instantiation, the instantiator will enter constant
evaluated
context before instantiate a template argument originated from an
expression,
and this impedes the instantiator from creating lambdas with independent
types.
This patch solves the problem via widening the condition that the
instantiator
marks lambdas as never dependent, and fixes the issue #57960
Differential Revision: https://reviews.llvm.org/D140554
Distinct lambda expressions are always considered non-equivalent, so two
token-for-token identical function declarations whose signatures involve
lambda-expressions declare distinct functions.
