[bindings/go] Add bindings to LLVMGet?CmpPredicate

[aykevl]

Summary

Add bindings so that predicates on comparisons (icmp/fcmp) can be inspected from IR.

Note: I considered adding Value.ICmpPredicate() etc. instead but Value.IntPredicate() seemed easier to read and matches the name of the returned type.

[aykevl]

Ping?

[whitequark]

LGTM

[aykevl]

Merged in r362893.

bindings/go/llvm/ir.go

func (v Value) Indices() []uint32 {
   rawIndices := (*[1 << 30]C.uint)(unsafe.Pointer(indicesPtr))[:num:num]
   indices := make([]uint32, num)
   for i := range indices {
     indices[i] = uint32(rawIndices[i])
   }
   return indices
 }
 
+// Operations on comparisons
+func (v Value) IntPredicate() IntPredicate     { return IntPredicate(C.LLVMGetICmpPredicate(v.C)) }
+func (v Value) FloatPredicate() FloatPredicate { return FloatPredicate(C.LLVMGetFCmpPredicate(v.C)) }
+
 //-------------------------------------------------------------------------
 // llvm.Builder
 //-------------------------------------------------------------------------
 
 // An instruction builder represents a point within a basic block, and is the
 // exclusive means of building instructions using the C interface.
 
 func (c Context) NewBuilder() (b Builder) { b.C = C.LLVMCreateBuilderInContext(c.C); return }