Add conversion rules for Float/Double negation (KeYProject#3520)

Author: wadoon

key.core/src/main/resources/de/uka/ilkd/key/proof/rules/floatRulesAssumeStrictfp.key

@@ -8,6 +8,11 @@
 }
 
 \rules(programRules:Java, floatRules:assumeStrictfp) {
+    translateJavaUnaryMinusFloat {
+        \find(javaUnaryMinusFloat(f1))
+        \replacewith(negFloat(f1))
+        \heuristics(javaFloatSemantics)
+    };
 
     translateJavaAddFloat {
         \find(javaAddFloat(f1, f2))
@@ -33,6 +38,12 @@
         \heuristics(javaFloatSemantics)
     };
 
+    translateJavaUnaryMinusDouble {
+        \find(javaUnaryMinusDouble(d1))
+        \replacewith(negDouble(d1))
+        \heuristics(javaFloatSemantics)
+    };
+
     translateJavaAddDouble {
         \find(javaAddDouble(d1, d2))
         \replacewith(addDouble(d1, d2))