[NFC][AArch64] Add Test for PR61549

[lenary]

Self-approving as @RKSimon approved the main case this is shown as fixing.

[RKSimon]

LGTM

llvm/test/CodeGen/AArch64/pr61549.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=aarch64 | FileCheck %s
+; RUN: llc < %s -mtriple=aarch64 --global-isel | FileCheck %s --check-prefix=GISEL
+
+define i35 @f(i35 %0) {
+; CHECK-LABEL: f:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    mov w8, #1 // =0x1
+; CHECK-NEXT:    sbfx x9, x0, #0, #35
+; CHECK-NEXT:    sdiv x10, x8, x9
+; CHECK-NEXT:    msub x8, x10, x9, x8
+; CHECK-NEXT:    eor x0, x8, #0x1
+; CHECK-NEXT:    ret
+;
+; GISEL-LABEL: f:
+; GISEL:       // %bb.0:
+; GISEL-NEXT:    mov w8, #1 // =0x1
+; GISEL-NEXT:    sbfx x9, x0, #0, #35
+; GISEL-NEXT:    sdiv x10, x8, x9
+; GISEL-NEXT:    msub x8, x10, x9, x8
+; GISEL-NEXT:    and x8, x8, #0x7ffffffff
+; GISEL-NEXT:    clz x8, x8
+; GISEL-NEXT:    sub x8, x8, #29
+; GISEL-NEXT:    ubfx x0, x8, #5, #30
+; GISEL-NEXT:    ret
+  %2 = srem i35 1, %0
+  %3 = call i35 @llvm.ctlz.i35(i35 %2, i1 false)
+  %4 = lshr i35 %3, 5
+  ret i35 %4
+}
+
+declare i35 @llvm.ctlz.i35(i35, i1 immarg)