Fix comments about IndirectBrInst in Instructions.h

[yo]

Summary

There seems to be some misplaced comments in IndirectBrInst's class definition.
The comments are actually SwitchInst's. This patch fixes the comments.

[lattner]

LGTM

[yo]

Thanks Chris ! Much appreciate for your fast response.
However, since I'm new to this development community, I don't have commit access to the svn.
Could you help me commit this patch ?
Thanks again !

include/llvm/IR/Instructions.h

 //===----------------------------------------------------------------------===//
 //                             IndirectBrInst Class
 //===----------------------------------------------------------------------===//
 
 //===---------------------------------------------------------------------------
 /// Indirect Branch Instruction.
 ///
 class IndirectBrInst : public TerminatorInst {
   void *operator new(size_t, unsigned) = delete;
   unsigned ReservedSpace;
-  // Operand[0]    = Value to switch on
-  // Operand[1]    = Default basic block destination
-  // Operand[2n  ] = Value to match
-  // Operand[2n+1] = BasicBlock to go to on match
+  // Operand[0]   = Address to jump to
+  // Operand[n+1] = n-th destination
   IndirectBrInst(const IndirectBrInst &IBI);
   void init(Value *Address, unsigned NumDests);
   void growOperands();
   // allocate space for exactly zero operands
   void *operator new(size_t s) {
     return User::operator new(s);
   }
   /// Create a new indirectbr instruction, specifying an
   /// Address to jump to.  The number of expected destinations can be specified
   /// here to make memory allocation more efficient.  This constructor can also