Remove f16 const eval crash test

Const eval negation was added. This test is now covered by Miri tests,
and merged into an existing UI test.

Fixes <#124583>

Author: tgross35

tests/crashes/124583.rs

@@ -1,3 +1,5 @@
+// Make sure negation happens correctly. Also included:
+// issue: rust-lang/rust#124583
 //@ run-pass
 
 #![feature(f16)]
@@ -8,9 +10,11 @@ fn main() {
     assert_eq!((-0.0_f16).to_bits(), 0x8000);
     assert_eq!(10.0_f16.to_bits(), 0x4900);
     assert_eq!((-10.0_f16).to_bits(), 0xC900);
+    assert_eq!((-(-0.0f16)).to_bits(), 0x0000);
 
     assert_eq!(0.0_f128.to_bits(), 0x0000_0000_0000_0000_0000_0000_0000_0000);
     assert_eq!((-0.0_f128).to_bits(), 0x8000_0000_0000_0000_0000_0000_0000_0000);
     assert_eq!(10.0_f128.to_bits(), 0x4002_4000_0000_0000_0000_0000_0000_0000);
     assert_eq!((-10.0_f128).to_bits(), 0xC002_4000_0000_0000_0000_0000_0000_0000);
+    assert_eq!((-(-0.0f128)).to_bits(), 0x0000_0000_0000_0000_0000_0000_0000_0000);
 }