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)!!
 

libraries/stdlib/wasm/builtins/kotlin/Primitives.kt

@@ -1491,9 +1491,8 @@ public class Float private constructor(public val value: Float) : Number(), Comp
         /**
          * A constant holding the "not a number" value of Float.
          */
-        public val NaN: Float
-            get() =
-                wasm_float_nan()
+        @Suppress("DIVISION_BY_ZERO")
+        public val NaN: Float = 0.0f / 0.0f
     }
 
     /**
@@ -1800,10 +1799,8 @@ public class Double private constructor(public val value: Double) : Number(), Co
         /**
          * A constant holding the "not a number" value of Double.
          */
-        public val NaN: Double
-            get() =
-                wasm_double_nan()
-
+        @Suppress("DIVISION_BY_ZERO")
+        public val NaN: Double = 0.0 / 0.0
     }
 
     /**

libraries/stdlib/wasm/internal/kotlin/wasm/internal/WasmInstructions.kt

@@ -13,12 +13,6 @@ package kotlin.wasm.internal
 internal fun wasm_unreachable(): Nothing =
     implementedAsIntrinsic
 
-internal fun wasm_float_nan(): Float =
-    implementedAsIntrinsic
-
-internal fun wasm_double_nan(): Double =
-    implementedAsIntrinsic
-
 internal fun <To> wasm_ref_cast(a: Any?): To =
     implementedAsIntrinsic