std: don't get CPU context when using CBE targeting MSVC
Calling `current` here causes compilation failures as the C backend
currently does not emit valid MSVC inline assembly. This change means
that when building for MSVC with the self-hosted C backend, only FP
unwinding can be used.
084e92879amlugg committed on 9/30/2025, 12:44:55 PMparentdae703d