Add lengthof and endof templates that hide a lot of sizeof computations.
Patch by Sterling Stein!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41758 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86InstrInfo.cpp b/lib/Target/X86/X86InstrInfo.cpp
index f34fcf0..017c799 100644
--- a/lib/Target/X86/X86InstrInfo.cpp
+++ b/lib/Target/X86/X86InstrInfo.cpp
@@ -17,13 +17,14 @@
 #include "X86InstrBuilder.h"
 #include "X86Subtarget.h"
 #include "X86TargetMachine.h"
+#include "llvm/ADT/STLExtras.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/LiveVariables.h"
 #include "llvm/CodeGen/SSARegMap.h"
 using namespace llvm;
 
 X86InstrInfo::X86InstrInfo(X86TargetMachine &tm)
-  : TargetInstrInfo(X86Insts, sizeof(X86Insts)/sizeof(X86Insts[0])),
+  : TargetInstrInfo(X86Insts, array_lengthof(X86Insts)),
     TM(tm), RI(tm, *this) {
 }