add tests

Author: RalfJung

tests/ui/const_prop/issue-102403.rs

@@ -0,0 +1,15 @@
+// run-pass
+// compile-flags: -O -Zmir-opt-level=3 -Cno-prepopulate-passes
+
+// Regression test for a broken MIR optimization.
+pub fn f() -> f64 {
+    std::hint::black_box(-1.0) % std::hint::black_box(-1.0)
+}
+
+pub fn g() -> f64 {
+    -1.0 % -1.0
+}
+
+pub fn main() {
+    assert_eq!(f().signum(), g().signum());
+}

tests/ui/const_prop/issue-113407.rs

@@ -0,0 +1,8 @@
+// run-pass
+// compile-flags: -O -Zmir-opt-level=3 -Cno-prepopulate-passes
+
+// Regression test for a broken MIR optimization.
+pub fn main() {
+    let f = f64::from_bits(0x19873cc2) as f32;
+    assert_eq!(f.to_bits(), 0);
+}