[OpenCL][PR42033] Fix addr space deduction with template parameters

[OpenCL][PR42033] Fix addr space deduction with template parameters

If dependent types appear in pointers or references we allow addr
space deduction because the addr space in template argument will
belong to the pointee and not the pointer or reference itself.

We also don't diagnose addr space on a function return type after
template instantiation. If any addr space for the return type was
provided on a template parameter this will be diagnosed during the
parsing of template definition.

Differential Revision: https://reviews.llvm.org/D62584

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@366417 91177308-0d34-0410-b5e6-96231b3b80d8