[Float2Int] Pre-commit test for SIToFP/UIToFP ConstantRange bug. NFC

The range for these operations is being constructed without the
maximum value for the range due to an incorrect usage of the
ConstantRange constructor.

This causes Float2Int to think the range for 'uitofp i1' only
contains 0 instead of 0 and 1.

Author: topperc

llvm/test/Transforms/Float2Int/pr79158.ll

@@ -0,0 +1,19 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
+; RUN: opt < %s -passes=float2int -S | FileCheck %s
+
+define i32 @pr79158(i32 %x) {
+; CHECK-LABEL: define i32 @pr79158(
+; CHECK-SAME: i32 [[X:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i32 [[X]], 0
+; CHECK-NEXT:    [[TMP0:%.*]] = zext i1 [[CMP]] to i32
+; CHECK-NEXT:    [[MUL1:%.*]] = mul i32 [[TMP0]], 2147483647
+; CHECK-NEXT:    ret i32 [[MUL1]]
+;
+entry:
+  %cmp = icmp sgt i32 %x, 0
+  %conv = uitofp i1 %cmp to double
+  %mul = fmul double %conv, 0x41EFFFFFFFE00000
+  %conv1 = fptoui double %mul to i32
+  ret i32 %conv1
+}