[RISCV] Add correct predicate over FMV instructions

[kv-sc]

Summary

Restricts FMV usage for subtargets without 'f' extension.

[craig.topper]

LGTM

llvm/lib/Target/RISCV/RISCVInstrInfoF.td

 defm FCVT_W_S : FPUnaryOp_r_frm_m<0b1100000, 0b00000, XFINX, "fcvt.w.s">,
                 Sched<[WriteFCvtF32ToI32, ReadFCvtF32ToI32]>;
 defm          : FPUnaryOpDynFrmAlias_m<FCVT_W_S, "fcvt.w.s", XFINX>;
 
 defm FCVT_WU_S : FPUnaryOp_r_frm_m<0b1100000, 0b00001, XFINX, "fcvt.wu.s">,
                  Sched<[WriteFCvtF32ToI32, ReadFCvtF32ToI32]>;
 defm           : FPUnaryOpDynFrmAlias_m<FCVT_WU_S, "fcvt.wu.s", XFINX>;
 
-let mayRaiseFPException = 0 in
+let Predicates = [HasStdExtF], mayRaiseFPException = 0 in
 def FMV_X_W : FPUnaryOp_r<0b1110000, 0b00000, 0b000, GPR, FPR32, "fmv.x.w">,
               Sched<[WriteFMovF32ToI32, ReadFMovF32ToI32]>;
 
 let SchedRW = [WriteFCmp32, ReadFCmp32, ReadFCmp32] in {
 defm FEQ_S : FPCmp_rr_m<0b1010000, 0b010, "feq.s", FINX, /*Commutable*/1>;
 defm FLT_S : FPCmp_rr_m<0b1010000, 0b001, "flt.s", FINX>;
 defm FLE_S : FPCmp_rr_m<0b1010000, 0b000, "fle.s", FINX>;
 }
 
 let mayRaiseFPException = 0 in
 defm FCLASS_S : FPUnaryOp_r_m<0b1110000, 0b00000, 0b001, XFINX, "fclass.s">,
                 Sched<[WriteFClass32, ReadFClass32]>;
 
 defm FCVT_S_W : FPUnaryOp_r_frm_m<0b1101000, 0b00000, FXINX, "fcvt.s.w">,
                 Sched<[WriteFCvtI32ToF32, ReadFCvtI32ToF32]>;
 defm          : FPUnaryOpDynFrmAlias_m<FCVT_S_W, "fcvt.s.w", FXINX>;
 
 defm FCVT_S_WU : FPUnaryOp_r_frm_m<0b1101000, 0b00001, FXINX, "fcvt.s.wu">,
                  Sched<[WriteFCvtI32ToF32, ReadFCvtI32ToF32]>;
 defm           : FPUnaryOpDynFrmAlias_m<FCVT_S_WU, "fcvt.s.wu", FXINX>;
 
-let mayRaiseFPException = 0 in
+let Predicates = [HasStdExtF], mayRaiseFPException = 0 in
 def FMV_W_X : FPUnaryOp_r<0b1111000, 0b00000, 0b000, FPR32, GPR, "fmv.w.x">,
               Sched<[WriteFMovI32ToF32, ReadFMovI32ToF32]>;
 
 defm FCVT_L_S  : FPUnaryOp_r_frm_m<0b1100000, 0b00010, XFIN64X, "fcvt.l.s">,
                  Sched<[WriteFCvtF32ToI64, ReadFCvtF32ToI64]>;
 defm           : FPUnaryOpDynFrmAlias_m<FCVT_L_S, "fcvt.l.s", XFIN64X>;
 
 defm FCVT_LU_S  : FPUnaryOp_r_frm_m<0b1100000, 0b00011, XFIN64X, "fcvt.lu.s">,