emulators/rpcs3: unbreak on -CURRENT via devel/llvm*

Assertion failed: (It != IISet.rend() && "ConstantExpr marked IsImmediateInvocation should " "be present"), function RemoveImmediateInvocation, file /usr/src/contrib/llvm-project/clang/lib/Sema/SemaExpr.cpp, line 17572.

Reported by: pkg-fallout