[codegen] Remove extra if from CodeGenerator::FinishFrame

We just asked if saves_fp was different than 0 two lines above.

Change-Id: I8cca5206041d3436ac7b2d619ab82f5955e99aaf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2888285
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Auto-Submit: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74518}

src/compiler/backend/x64/code-generator-x64.cc

@@ -4421,13 +4421,11 @@ void CodeGenerator::FinishFrame(Frame* frame) {
   CallDescriptor* call_descriptor = linkage()->GetIncomingDescriptor();
 
   const RegList saves_fp = call_descriptor->CalleeSavedFPRegisters();
-  if (saves_fp != 0) {
+  if (saves_fp != 0) {  // Save callee-saved XMM registers.
     frame->AlignSavedCalleeRegisterSlots();
-    if (saves_fp != 0) {  // Save callee-saved XMM registers.
-      const uint32_t saves_fp_count = base::bits::CountPopulation(saves_fp);
-      frame->AllocateSavedCalleeRegisterSlots(
-          saves_fp_count * (kQuadWordSize / kSystemPointerSize));
-    }
+    const uint32_t saves_fp_count = base::bits::CountPopulation(saves_fp);
+    frame->AllocateSavedCalleeRegisterSlots(
+        saves_fp_count * (kQuadWordSize / kSystemPointerSize));
   }
   const RegList saves = call_descriptor->CalleeSavedRegisters();
   if (saves != 0) {  // Save callee-saved registers.