Refactor F32 VLRELU microkernels

Split F32 VLRELU parameter initialization by ISA

PiperOrigin-RevId: 418962853
diff --git a/src/f32-vlrelu/wasmsimd-bitselect.c.in b/src/f32-vlrelu/wasmsimd-bitselect.c.in
index 674ca0e..f8bbfd4 100644
--- a/src/f32-vlrelu/wasmsimd-bitselect.c.in
+++ b/src/f32-vlrelu/wasmsimd-bitselect.c.in
@@ -23,7 +23,7 @@
   assert(n != 0);
   assert(n % sizeof(float) == 0);
 
-  const v128_t vslope = wasm_v128_load32_splat(&params->scalar.slope);
+  const v128_t vslope = wasm_v128_load64_splat(params->wasmsimd.slope);
   $if BATCH_TILE > 4:
     for (; n >= ${BATCH_TILE} * sizeof(float); n -= ${BATCH_TILE} * sizeof(float)) {
       const v128_t vx${ABC[0:4]} = wasm_v128_load(x);