X87 Instruction support

[pgoodman]

Implement and test the following instructions:

• [x] F2XM1
• [x] FABS
• [x] FADD
• [x] FADDP
• [x] FBLD
• [x] FBSTP
• [x] FCHS
• [x] FCMOVB
• [x] FCMOVBE
• [x] FCMOVE
• [x] FCMOVNB
• [x] FCMOVNBE
• [x] FCMOVNE
• [x] FCMOVNU
• [x] FCMOVU
• [x] FCOM
• [x] FCOMI
• [x] FCOMIP
• [x] FCOMP
• [x] FCOMPP
• [x] FCOS
• [x] FDECSTP
• [ ] FDISI8087_NOP
• [x] FDIV
• [x] FDIVP
• [x] FDIVR
• [x] FDIVRP
• [ ] FENI8087_NOP
• [x] FFREE
• [x] FFREEP
• [x] FIADD
• [ ] FICOM
• [ ] FICOMP
• [x] FIDIV
• [x] FIDIVR
• [x] FILD
• [x] FIMUL
• [x] FINCSTP
• [x] FIST
• [x] FISTP
• [x] FISTTP
• [x] FISUB
• [x] FISUBR
• [x] FLD
• [x] FLD1
• [x] FLDCW
• [ ] FLDENV
• [x] FLDL2E
• [x] FLDL2T
• [x] FLDLG2
• [x] FLDLN2
• [x] FLDPI
• [x] FLDZ
• [x] FMUL
• [x] FMULP
• [x] FNCLEX
• [x] FNINIT
• [x] FNOP
• [ ] FNSAVE
• [x] FNSTCW
• [ ] FNSTENV
• [x] FNSTSW
• [x] FPATAN
• [x] FPREM
• [x] FPREM1
• [x] FPTAN
• [x] FRNDINT
• [ ] FRSTOR
• [x] FSCALE
• [ ] FSETPM287_NOP
• [x] FSIN
• [x] FSINCOS
• [x] FSQRT
• [x] FST
• [x] FSTP
• [x] FSTPNCE
• [x] FSUB
• [x] FSUBP
• [x] FSUBR
• [x] FSUBRP
• [x] FTST
• [x] FUCOM
• [x] FUCOMI
• [x] FUCOMIP
• [x] FUCOMP
• [x] FUCOMPP
• [x] FWAIT
• [x] FXAM
• [x] FXCH
• [ ] FXTRACT
• [x] FYL2X
• [x] FYL2XP1

[mike-myers-tob]

• [ ] (X86 f115d018 5 (BYTES 0f ae 44 24 30) FXSAVE_MEMmfpxenv (WRITE_OP (DWORD_PTR (ADD (REG_32 SS_BASE) (REG_32 ESP) (SIGNED_IMM_32 0x30)))))
• [ ] FXRSTOR