[turbofan] Implement rounding of floats on x64 and ia32 without sse4.1.

test/cctest/wasm/test-run-wasm.cc

Index: test/cctest/wasm/test-run-wasm.cc
diff --git a/test/cctest/wasm/test-run-wasm.cc b/test/cctest/wasm/test-run-wasm.cc
index 196aea4f57e9aebf872d4f4c5805b50992300e74..1d6af893ecd9a944a2b487a3cb33c396ceab38f4 100644
--- a/test/cctest/wasm/test-run-wasm.cc
+++ b/test/cctest/wasm/test-run-wasm.cc
@@ -2933,9 +2933,6 @@ TEST(Run_Wasm_MultipleCallIndirect) {
 }
 
 
-// TODO(titzer): Fix for nosee4 and re-enable.
-#if 0
-
 TEST(Run_Wasm_F32Floor) {
   WasmRunner<float> r(MachineType::Float32());
   BUILD(r, WASM_F32_FLOOR(WASM_GET_LOCAL(0)));
@@ -2999,8 +2996,6 @@ TEST(Run_Wasm_F64NearestInt) {
   FOR_FLOAT64_INPUTS(i) { CheckDoubleEq(nearbyint(*i), r.Call(*i)); }
 }
 
-#endif
-
 
 TEST(Run_Wasm_F32Min) {
   WasmRunner<float> r(MachineType::Float32(), MachineType::Float32());