[ia32/x64] Remove unnecessary code flush in RelocInfo::Visit

Bug: v8:8562
Change-Id: I6f7dcaf888d0012fba2798613523c45d584753d4
Reviewed-on: https://chromium-review.googlesource.com/c/1456102Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59416}

src/ia32/assembler-ia32-inl.h

@@ -175,7 +175,6 @@ void RelocInfo::Visit(ObjectVisitor* visitor) {
   RelocInfo::Mode mode = rmode();
   if (mode == RelocInfo::EMBEDDED_OBJECT) {
     visitor->VisitEmbeddedPointer(host(), this);
-    Assembler::FlushICache(pc_, sizeof(Address));
   } else if (RelocInfo::IsCodeTargetMode(mode)) {
     visitor->VisitCodeTarget(host(), this);
   } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {

src/x64/assembler-x64-inl.h

@@ -400,7 +400,6 @@ void RelocInfo::Visit(ObjectVisitor* visitor) {
   RelocInfo::Mode mode = rmode();
   if (mode == RelocInfo::EMBEDDED_OBJECT) {
     visitor->VisitEmbeddedPointer(host(), this);
-    Assembler::FlushICache(pc_, sizeof(Address));
   } else if (RelocInfo::IsCodeTargetMode(mode)) {
     visitor->VisitCodeTarget(host(), this);
   } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {