Fix handling of dontcall attributes for arches that lower calls via fastSelectInstruction (#153302) Recently my change to avoid duplicate `dontcall` attribute errors (#152810) caused the Clang `Frontend/backend-attribute-error-warning.c` test to fail on Arm32: <https://lab.llvm.org/buildbot/#/builders/154/builds/20134> The root cause is that, if the default `IFastSel` path bails, then targets are given the opportunity to lower instructions via `fastSelectInstruction`. That's the path taken by Arm32 and since its implementation of `selectCall` didn't call `diagnoseDontCall` no error was emitted. I've checked the other implementations of `fastSelectInstruction` and the only other one that lowers call instructions in WebAssembly, so I've fixed that too.
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