Assertion in Scalar Evolution when running IRCE

[gbaraldi]

The following IR crashes with

define void @foo() {
top:
  br label %L3

L3:                                               ; preds = %L13, %top
  %value_phi = phi ptr [ null, %top ], [ %0, %L13 ]
  %0 = getelementptr i8, ptr %value_phi, i64 8
  %.not = icmp ule ptr %value_phi, null
  br i1 %.not, label %L13, label %L15

L13:                                              ; preds = %L3
  br label %L3

L15:                                              ; preds = %L3
  ret void
}

opt --passes=irce

https://godbolt.org/z/1sbvaT7r1

[nikic]

/cherry-pick 22da5a6

[llvmbot]

/pull-request #90182