[Turbofan] Allow FP operands and vregs in InstructionSequenceTest.

test/unittests/compiler/register-allocator-unittest.cc

Index: test/unittests/compiler/register-allocator-unittest.cc
diff --git a/test/unittests/compiler/register-allocator-unittest.cc b/test/unittests/compiler/register-allocator-unittest.cc
index 71a726f1677450d5d2a1bd6c3a6ef4797ece2337..274e24a8fa0ae3b75cbfbd1c6922d046843aa322 100644
--- a/test/unittests/compiler/register-allocator-unittest.cc
+++ b/test/unittests/compiler/register-allocator-unittest.cc
@@ -101,6 +101,17 @@ TEST_F(RegisterAllocatorTest, CanAllocateThreeRegisters) {
   Allocate();
 }
 
+TEST_F(RegisterAllocatorTest, CanAllocateThreeFPRegisters) {
+  // return p0 + p1;
+  StartBlock();
+  VReg a_reg = FPParameter(kFloat64);
+  VReg b_reg = FPParameter(kFloat64);
+  VReg c_reg = EmitOI(Reg(1, kFloat64), Reg(a_reg, 1), Reg(b_reg, 0));
+  Return(c_reg);
+  EndBlock(Last());
+
+  Allocate();
+}
 
 TEST_F(RegisterAllocatorTest, SimpleLoop) {
   // i = K;