[assembler][ia32] Fix redundant condition

Immediate::is_zero already checks the reloc info to be none, so the
additional check is redundant.

R=tebbi@chromium.org

Change-Id: I3ec91fe60e8c659b2f38fda0123784a69e4bcbe9
Reviewed-on: https://chromium-review.googlesource.com/878321Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50760}

src/ia32/macro-assembler-ia32.cc

@@ -1159,8 +1159,7 @@ void TurboAssembler::Move(Register dst, Register src) {
 }
 
 void TurboAssembler::Move(Register dst, const Immediate& x) {
-  if (!x.is_heap_object_request() && x.is_zero() &&
-      RelocInfo::IsNone(x.rmode())) {
+  if (!x.is_heap_object_request() && x.is_zero()) {
     xor_(dst, dst);  // Shorter than mov of 32-bit immediate 0.
   } else {
     mov(dst, x);