WASM: Don't use intrinsics to specify NaN's

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/WasmSymbols.kt

@@ -70,8 +70,6 @@ class WasmSymbols(
         get() = TODO()
 
     val wasmUnreachable = getInternalFunction("wasm_unreachable")
-    val wasmFloatNaN = getInternalFunction("wasm_float_nan")
-    val wasmDoubleNaN = getInternalFunction("wasm_double_nan")
 
     val equalityFunctions = mapOf(
         context.irBuiltIns.booleanType to getInternalFunction("wasm_i32_eq"),

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/ir2wasm/BodyGenerator.kt

@@ -284,13 +284,6 @@ class BodyGenerator(val context: WasmFunctionCodegenContext) : IrElementVisitorV
                 body.buildRefCast()
             }
 
-            wasmSymbols.wasmFloatNaN -> {
-                body.buildConstF32(Float.NaN)
-            }
-            wasmSymbols.wasmDoubleNaN -> {
-                body.buildConstF64(Double.NaN)
-            }
-
             wasmSymbols.unboxIntrinsic -> {
                 val fromType = call.getTypeArgument(0)!!