Remove some regs that are not used.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22975 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/PowerPC/PPCInstrInfo.td

@@ -97,7 +97,7 @@ let isCall = 1,
   // All calls clobber the non-callee saved registers...
   Defs = [R0,R2,R3,R4,R5,R6,R7,R8,R9,R10,R11,R12,
           F0,F1,F2,F3,F4,F5,F6,F7,F8,F9,F10,F11,F12,F13,
-          LR,XER,CTR,
+          LR,CTR,
           CR0,CR1,CR5,CR6,CR7] in {
   // Convenient aliases for call instructions
   def CALLpcrel : IForm<18, 0, 1, (ops target:$func, variable_ops), "bl $func">;

lib/Target/PowerPC/PPCRegisterInfo.td

@@ -79,15 +79,8 @@ def CR2 : CR<2, "cr2">; def CR3 : CR<3, "cr3">;
 def CR4 : CR<4, "cr4">; def CR5 : CR<5, "cr5">;
 def CR6 : CR<6, "cr6">; def CR7 : CR<7, "cr7">;
 
-// Floating-point status and control register
-def FPSCR : SPR<0, "fpscr">;
-// fiXed-point Exception Register? :-)
-def XER : SPR<1, "xer">;
 // Link register
 def LR : SPR<2,   "lr">;
 // Count register
 def CTR : SPR<3, "ctr">;
-// These are the "time base" registers which are read-only in user mode.
-def TBL : SPR<4, "tbl">;
-def TBU : SPR<5, "tbu">;