fuzzgen: Don't generate float unordered vector ops on aarch64 (#12442)

This is a refinement of the change in #12196 to fix fuzzgen on oss-fuzz
because aarch64 doesn't currently have lowerings for these float
orderings, only the scalar versions were added in #12196.

Author: alexcrichton

cranelift/fuzzgen/src/function_generator.rs

@@ -200,6 +200,14 @@ fn insert_cmp(
             (Architecture::Aarch64(_), FloatCC::OrderedNotEqual) => true,
             (Architecture::Aarch64(_), FloatCC::UnorderedOrEqual) => true,
 
+            // Not implemented on aarch64 for vectors
+            (Architecture::Aarch64(_), FloatCC::UnorderedOrLessThan)
+            | (Architecture::Aarch64(_), FloatCC::UnorderedOrLessThanOrEqual)
+            | (Architecture::Aarch64(_), FloatCC::UnorderedOrGreaterThan)
+            | (Architecture::Aarch64(_), FloatCC::UnorderedOrGreaterThanOrEqual) => {
+                args[0].is_vector()
+            }
+
             // These are not implemented on x86_64, for vectors.
             (Architecture::X86_64, FloatCC::UnorderedOrEqual | FloatCC::OrderedNotEqual) => {
                 args[0].is_vector()