[wasm-simd] Optmize F64x2ReplaceLane when lane == 0

Use movsd/vmovsd instead of pblendw/vpblendw. It is two bytes shorter,
and avoids mixing integer and floating-point domain instructions.

Bug: v8:12074
Change-Id: Ia41072fbf8da7d99618a55d59634f7399a7105ce
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3088358Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#76287}

src/codegen/shared-ia32-x64/macro-assembler-shared-ia32-x64.cc

@@ -112,7 +112,7 @@ void SharedTurboAssembler::F64x2ReplaceLane(XMMRegister dst, XMMRegister src,
   if (CpuFeatures::IsSupported(AVX)) {
     CpuFeatureScope scope(this, AVX);
     if (lane == 0) {
-      vpblendw(dst, src, rep, 0b00001111);
+      vmovsd(dst, src, rep);
     } else {
       vmovlhps(dst, src, rep);
     }
@@ -123,7 +123,7 @@ void SharedTurboAssembler::F64x2ReplaceLane(XMMRegister dst, XMMRegister src,
       movaps(dst, src);
     }
     if (lane == 0) {
-      pblendw(dst, rep, 0b00001111);
+      movsd(dst, rep);
     } else {
       movlhps(dst, rep);
     }