Generate something sensible for an [SU]ADDO op when the overflow/carry flag is

the conditional for the BRCOND statement. For instance, it will generate:

    addl %eax, %ecx
    jo LOF

instead of

    addl %eax, %ecx
    ; About 10 instructions to compare the signs of LHS, RHS, and sum.
    jl LOF



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60123 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/X86InstrInfo.h

@@ -41,9 +41,11 @@ namespace X86 {
     COND_NO = 10,
     COND_NP = 11,
     COND_NS = 12,
-    COND_O  = 13,
-    COND_P  = 14,
-    COND_S  = 15,
+    COND_NC = 13,
+    COND_O  = 14,
+    COND_P  = 15,
+    COND_S  = 16,
+    COND_C  = 17,
 
     // Artificial condition codes. These are used by AnalyzeBranch
     // to indicate a block terminated with two conditional branches to