[CIR][CIRGen][Builtin] Support __builtin_launder except in the case of -fstrict-vtable-pointers #1138
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Without using flag
-fstrict-vtable-pointers,__builtin_launderis a noop. This PR implements that, and leave implementation for the case of-fstrict-vtable-pointersto future where there is a need.This PR also adapted most of test cases from OG test case.
I didn't use test cases in the namespace pessimizing_cases, as they have no difference even when
-fstrict-vtable-pointersis on.