x86: set op class of two fp instructions

This patch sets op class of two fp instructions: movfp and pop x87 stack
as IntAluOp since these instructions do not make use of the fp alu.

src/arch/x86/isa/microops/fpop.isa

@@ -270,6 +270,7 @@ let {{
         else_code = 'FpDestReg_uqw = FpDestReg_uqw;'
         cond_check = "checkCondition(ccFlagBits | cfofBits | dfBit | \
                                      ecfBit | ezfBit, src2)"
+        op_class = 'IntAluOp'
 
     class Xorfp(FpBinaryOp):
         code = 'FpDestReg_uqw = FpSrcReg1_uqw ^ FpSrcReg2_uqw;'
@@ -449,4 +450,5 @@ let {{
                     spm=spm, SetStatus=False, UpdateFTW=UpdateFTW)
 
         code = ''
+        op_class = 'IntAluOp'
 }};