Passing constant integer arguments to dst causes ICE

[pema99]

Description
Passing integer arguments to dst causes an ICE.

Maybe related to #8428?

Steps to Reproduce
Shader:

[shader("pixel")]
void PSMain() {
    int4 r = dst(1, 1);
    if (r.x != 1) discard;
}

Command: dxc.exe -T ps_6_6 -E PSMain dst_int.hlsl

Actual Behavior

error: llvm::cast() argument of incompatible type!

Environment

• dxcompiler.dll: 1.9(5184-21d28f72)(1.9.2602.17) - 1.9.2602.17 (21d28f727)
• Windows 10