Require CMOV support for the ia32 port.

src/ia32/assembler-ia32.cc

Index: src/ia32/assembler-ia32.cc
diff --git a/src/ia32/assembler-ia32.cc b/src/ia32/assembler-ia32.cc
index 58ccb1ce9545044df92c94e6de279127b2ed05f1..66c6d1b83e742afb52debb87a5b159cc9505a2d8 100644
--- a/src/ia32/assembler-ia32.cc
+++ b/src/ia32/assembler-ia32.cc
@@ -98,10 +98,7 @@ void CpuFeatures::Probe(bool serializer_enabled) {
   }
 
   CHECK(cpu.has_sse2());  // SSE2 support is mandatory.
-
-  if (cpu.has_cmov()) {
-    probed_features |= static_cast<uint64_t>(1) << CMOV;
-  }
+  CHECK(cpu.has_cmov());  // CMOV support is mandatory.
 
   // SAHF must be available in compat/legacy mode.
   ASSERT(cpu.has_sahf());
@@ -636,7 +633,6 @@ void Assembler::movzx_w(Register dst, const Operand& src) {
 
 
 void Assembler::cmov(Condition cc, Register dst, const Operand& src) {
-  ASSERT(IsEnabled(CMOV));
   EnsureSpace ensure_space(this);
   // Opcode: 0f 40 + cc /r.
   EMIT(0x0F);