[IR] Use CallBase to simplify some code

[craig.topper]

Summary

This patch does the following to simplify the asm-goto patch

-Move isInlineAsm from CallInst to CallBase to share with CallBrInst in the asm-goto patch.
-Forward CallSite's data_operands_begin()/data_operands_end() to CallBase's implementation.
-Forward CallSite's getOperandBundlesAsDefs to CallBase.

[chandlerc]

LGTM

include/llvm/IR/CallSite.h

public:
   /// data_operands_begin/data_operands_end - Return iterators iterating over
   /// the call / invoke argument list and bundle operands.  For invokes, this is
   /// the set of instruction operands except the invoke target and the two
   /// successor blocks; and for calls this is the set of instruction operands
   /// except the call target.
 
   IterTy data_operands_begin() const {
     assert(getInstruction() && "Not a call or invoke instruction!");
-    return (*this)->op_begin();
+    return cast<CallBase>(getInstruction())->data_operands_begin();
   }
   IterTy data_operands_end() const {
     assert(getInstruction() && "Not a call or invoke instruction!");
-    return (*this)->op_end() - (isCall() ? 1 : 3);
+    return cast<CallBase>(getInstruction())->data_operands_end();
   }
   iterator_range<IterTy> data_ops() const {
     return make_range(data_operands_begin(), data_operands_end());
   }
   bool data_operands_empty() const {
     return data_operands_end() == data_operands_begin();
   }
   unsigned data_operands_size() const {
#define CALLSITE_DELEGATE_SETTER(METHOD) \
   IterTy arg_end() const {
     CALLSITE_DELEGATE_GETTER(arg_end());
   }
 
 #undef CALLSITE_DELEGATE_GETTER
 #undef CALLSITE_DELEGATE_SETTER
 
   void getOperandBundlesAsDefs(SmallVectorImpl<OperandBundleDef> &Defs) const {
-    const Instruction *II = getInstruction();
     // Since this is actually a getter that "looks like" a setter, don't use the
     // above macros to avoid confusion.
-    if (isCall())
-      cast<CallInst>(II)->getOperandBundlesAsDefs(Defs);
-    else
-      cast<InvokeInst>(II)->getOperandBundlesAsDefs(Defs);
+    cast<CallBase>(getInstruction())->getOperandBundlesAsDefs(Defs);
   }
 
   /// Determine whether this data operand is not captured.
   bool doesNotCapture(unsigned OpNo) const {
     return dataOperandHasImpliedAttr(OpNo + 1, Attribute::NoCapture);
   }
 
   /// Determine whether this argument is passed by value.

include/llvm/IR/InstrTypes.h

public:
 
   void setCallingConv(CallingConv::ID CC) {
     auto ID = static_cast<unsigned>(CC);
     assert(!(ID & ~CallingConv::MaxID) && "Unsupported calling convention");
     setInstructionSubclassData((getSubclassDataFromInstruction() & 3) |
                                (ID << 2));
   }
 
+  /// Check if this call is an inline asm statement.
+  bool isInlineAsm() const { return isa<InlineAsm>(getCalledOperand()); }
+
   /// \name Attribute API
   ///
   /// These methods access and modify attributes on this call (including
   /// looking through to the attributes on the called function when necessary).
   ///@{
 
   /// Return the parameter attributes for this call.
   ///

include/llvm/IR/Instructions.h

public:
   }
 
   /// Return true if the call can return twice
   bool canReturnTwice() const { return hasFnAttr(Attribute::ReturnsTwice); }
   void setCanReturnTwice() {
     addAttribute(AttributeList::FunctionIndex, Attribute::ReturnsTwice);
   }
 
-  /// Check if this call is an inline asm statement.
-  bool isInlineAsm() const { return isa<InlineAsm>(getCalledOperand()); }
-
   // Methods for support type inquiry through isa, cast, and dyn_cast:
   static bool classof(const Instruction *I) {
     return I->getOpcode() == Instruction::Call;
   }
   static bool classof(const Value *V) {
     return isa<Instruction>(V) && classof(cast<Instruction>(V));
   }