[InstCombine] Commuted pattern is not handled

[dtcxzyw]

https://godbolt.org/z/Wfqeo3rhK

define double @t1(i32 %x) {
  %cmp = icmp sgt i32 %x, 2
  %cst = sitofp i32 %x to double
  %sel = select i1 %cmp, double %cst, double 2.000000e+00
  ret double %sel
}

define double @t2(i32 %x) {
  %cmp = icmp sle i32 %x, 2
  %cst = sitofp i32 %x to double
  %sel = select i1 %cmp, double 2.000000e+00, double %cst
  ret double %sel
}

define double @t1(i32 %x) {
  %sel1 = call i32 @llvm.smax.i32(i32 %x, i32 2)
  %sel = uitofp nneg i32 %sel1 to double
  ret double %sel
}

define double @t2(i32 %x) {
  %cmp = icmp slt i32 %x, 3
  %cst = sitofp i32 %x to double
  %sel = select i1 %cmp, double 2.000000e+00, double %cst
  ret double %sel
}