[improve livetests] Truncate integral f32 to i64

As in https://crrev.com/i/7960389, this generator was just forgotten:
The WasmTruncatef32Toi64Generator got Wasm floats as inputs. Any
non-integral float cannot be converted and the Wasm function
will trap.

After this change we generate integral floats to be truncated.

Change-Id: Ia0e66bb94669310e335ce7b69d8f093aab124c4a
Reviewed-on: https://chrome-internal-review.googlesource.com/c/v8/fuzzilli/+/7967836
Commit-Queue: Eva Herencsárová <[email protected]>
Reviewed-by: Carl Smith <[email protected]>

Author: evicy

Sources/Fuzzilli/CodeGen/WasmCodeGenerators.swift

@@ -400,13 +400,14 @@ public let WasmCodeGenerators: [CodeGenerator] = [
         function.extendi32Toi64(input, isSigned: probability(0.5))
     },
 
-    CodeGenerator("WasmTruncatef32Toi64Generator", inContext: .wasmFunction, inputs: .required(.wasmf32)) { b, input in
+    CodeGenerator("WasmTruncatef32Toi64Generator", inContext: .wasmFunction) { b in
         let function = b.currentWasmModule.currentWasmFunction
         if probability(0.5) {
-            let res = function.wasmf32UnOp(input, unOpKind: .Abs)
-            function.truncatef32Toi64(res, isSigned: false)
+            let value = function.constf32(Float32(b.randomSize(upTo: Int64(Int32.max))))
+            function.truncatef32Toi64(value, isSigned: false)
         } else {
-            function.truncatef32Toi64(input, isSigned: true)
+            let value = function.constf32(Float32(b.randomInt() % Int64(Int32.max)))
+            function.truncatef32Toi64(value, isSigned: true)
         }
     },