Fix SSE2 debug asserts in LayoutTests

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/11675005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13280 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ia32/lithium-gap-resolver-ia32.cc

@@ -324,7 +324,6 @@ void LGapResolver::EmitMove(int index) {
     }
 
   } else if (source->IsDoubleRegister()) {
-    if (CpuFeatures::IsSupported(SSE2)) {
     CpuFeatures::Scope scope(SSE2);
     XMMRegister src = cgen_->ToDoubleRegister(source);
     if (destination->IsDoubleRegister()) {
@@ -335,11 +334,7 @@ void LGapResolver::EmitMove(int index) {
       Operand dst = cgen_->ToOperand(destination);
       __ movdbl(dst, src);
     }
-    } else {
-      UNREACHABLE();
-    }
   } else if (source->IsDoubleStackSlot()) {
-    if (CpuFeatures::IsSupported(SSE2)) {
     CpuFeatures::Scope scope(SSE2);
     ASSERT(destination->IsDoubleRegister() ||
            destination->IsDoubleStackSlot());
@@ -356,9 +351,6 @@ void LGapResolver::EmitMove(int index) {
   } else {
     UNREACHABLE();
   }
-  } else {
-    UNREACHABLE();
-  }
 
   RemoveMove(index);
 }
@@ -429,6 +421,7 @@ void LGapResolver::EmitSwap(int index) {
     __ movaps(dst, xmm0);
 
   } else if (source->IsDoubleRegister() || destination->IsDoubleRegister()) {
+    CpuFeatures::Scope scope(SSE2);
     // XMM register-memory swap.  We rely on having xmm0
     // available as a fixed scratch register.
     ASSERT(source->IsDoubleStackSlot() || destination->IsDoubleStackSlot());
@@ -442,6 +435,7 @@ void LGapResolver::EmitSwap(int index) {
     __ movdbl(reg, Operand(xmm0));
 
   } else if (source->IsDoubleStackSlot() && destination->IsDoubleStackSlot()) {
+    CpuFeatures::Scope scope(SSE2);
     // Double-width memory-to-memory.  Spill on demand to use a general
     // purpose temporary register and also rely on having xmm0 available as
     // a fixed scratch register.