Cranelift: Simple multiplication + out of bounds shift panics with "should be implemented in ISLE: inst = v12 = smulhi.i8 v0, v0, type = Some(types::I8)"

[bjorn3]

.clif Test Case

test compile
set opt_level=speed
target x86_64

function u0:9(i8) -> i16 system_v {
block0(v0: i8):
    v8 = sextend.i16 v0
    v9 = imul v8, v8
    v10 = iconst.i64 1000
    v13 = sshr v9, v10  ; v10 = 1000
    return v13
}

Steps to Reproduce

• Compile the above test case.

Expected Results

Compiles fine and masks the shift amount as expected.

Actual Results

Panics with "should be implemented in ISLE: inst = v12 = smulhi.i8 v0, v0, type = Some(types::I8)"

Versions and Environment

Cranelift version or commit: Tested with 0.104 and b6a8abc.

Operating system: N/A

Architecture: x86_64

Extra Info

Reported to cg_clif by @cbeuw in rust-lang/rustc_codegen_cranelift#1455.