[InstCombine] Add pre-commit tests for PR59555. NFC.

Author: dtcxzyw

llvm/test/Transforms/InstCombine/icmp-range.ll

@@ -1477,6 +1477,22 @@ define <2 x i1> @icmp_ne_sext_eq_otherwise_vec(<2 x i32> %a) {
   ret <2 x i1> %cmp1
 }
 
+; tests from PR59555
+define i1 @isFloat(i64 %0) {
+; CHECK-LABEL: @isFloat(
+; CHECK-NEXT:    [[TMP2:%.*]] = icmp ugt i64 [[TMP0:%.*]], 281474976710655
+; CHECK-NEXT:    [[TMP3:%.*]] = and i64 [[TMP0]], -281474976710656
+; CHECK-NEXT:    [[TMP4:%.*]] = icmp ne i64 [[TMP3]], 281474976710656
+; CHECK-NEXT:    [[TMP5:%.*]] = and i1 [[TMP2]], [[TMP4]]
+; CHECK-NEXT:    ret i1 [[TMP5]]
+;
+  %2 = icmp ugt i64 %0, 281474976710655
+  %3 = and i64 %0, -281474976710656
+  %4 = icmp ne i64 %3, 281474976710656
+  %5 = and i1 %2, %4
+  ret i1 %5
+}
+
 !0 = !{i32 1, i32 6}
 !1 = !{i32 0, i32 6}
 !2 = !{i8 0, i8 1}