Clarify the logic for when to build an overloaded binop.  In particular,
build one when either of the operands calls itself type-dependent;
previously we were building when one of the operand types was dependent,
which is not always the same thing and which can lead to unfortunate
inconsistencies later.  Fixes PR8739.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@120990 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed