x64: Finish migrating brz and brnz to ISLE (#4614)

https://github.com/bytecodealliance/wasmtime/pull/4614

cranelift/codegen/src/isa/x64/inst/mod.rs

@@ -619,18 +619,6 @@ impl Inst {
         }
     }
 
-    /// Does a comparison of dst & src for operands of size `size`.
-    pub(crate) fn test_rmi_r(size: OperandSize, src: RegMemImm, dst: Reg) -> Inst {
-        src.assert_regclass_is(RegClass::Int);
-        debug_assert_eq!(dst.class(), RegClass::Int);
-        Inst::CmpRmiR {
-            size,
-            src: GprMemImm::new(src).unwrap(),
-            dst: Gpr::new(dst).unwrap(),
-            opcode: CmpOpcode::Test,
-        }
-    }
-
     pub(crate) fn trap(trap_code: TrapCode) -> Inst {
         Inst::Ud2 { trap_code }
     }
@@ -729,14 +717,6 @@ impl Inst {
         Inst::JmpKnown { dst }
     }
 
-    pub(crate) fn jmp_cond(cc: CC, taken: MachLabel, not_taken: MachLabel) -> Inst {
-        Inst::JmpCond {
-            cc,
-            taken,
-            not_taken,
-        }
-    }
-
     pub(crate) fn jmp_unknown(target: RegMem) -> Inst {
         target.assert_regclass_is(RegClass::Int);
         Inst::JmpUnknown { target }