ISLE: Fix clif.isle InstructionData entries

Attempt to match a Jump instruction in ISLE will currently lead to the
generated files not compiling.  This is because the definition of the
InstructionData enum in clif.isle does not match the actual type used
in Rust code.

Specifically, clif.isle erroneously omits the ValueList variable-length
argument entry if the format does not use a typevar operand.  This is
the case for Jump and a few other formats.  The problem is caused by
a bug in the gen_isle routine in meta/src/gen_inst.rs.

cranelift/codegen/src/isa/aarch64/lower/isle/generated_code.manifest

@@ -1,4 +1,4 @@
-src/clif.isle f176ef3bba99365
+src/clif.isle 9ea75a6f790b5c03
 src/prelude.isle 51d2aef2566c1c96
 src/isa/aarch64/inst.isle f946561093de4ff5
 src/isa/aarch64/lower.isle 2d2e1e076a0c8a23

cranelift/codegen/src/isa/s390x/lower/isle/generated_code.manifest

@@ -1,4 +1,4 @@
-src/clif.isle f176ef3bba99365
+src/clif.isle 9ea75a6f790b5c03
 src/prelude.isle 51d2aef2566c1c96
 src/isa/s390x/inst.isle 63cf833b5cfd727d
 src/isa/s390x/lower.isle a0e21a567040bc33

cranelift/codegen/src/isa/x64/lower/isle/generated_code.manifest

@@ -1,4 +1,4 @@
-src/clif.isle f176ef3bba99365
+src/clif.isle 9ea75a6f790b5c03
 src/prelude.isle 51d2aef2566c1c96
 src/isa/x64/inst.isle 61004acbb1289816
 src/isa/x64/lower.isle 82db7f7d47ac7809