[GlobalISel] Fix crash in RBS with a non-generic IMPLICIT_DEF. #2751
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This may occur when swifterror codegen in the translator generates these,
but we shouldn't try to handle them since they should have regclasses anyway.
rdar://75784009
Differential Revision: https://reviews.llvm.org/D99287
(cherry picked from commit 0d2c4db)