Remove broken assert from CodeGen. Better check is done in Sema.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@45358 91177308-0d34-0410-b5e6-96231b3b80d8

CodeGen/CGExprScalar.cpp

@@ -756,10 +756,7 @@ Value *ScalarExprEmitter::VisitBinSub(const BinaryOperator *E) {
   Value *RHS = Visit(E->getRHS());
   
   const QualType LHSType = E->getLHS()->getType().getCanonicalType();
-  const QualType RHSType = E->getRHS()->getType().getCanonicalType();
-  assert(LHSType == RHSType && "Can't subtract different pointer types");
-  
-  QualType LHSElementType = cast<PointerType>(LHSType)->getPointeeType();
+  const QualType LHSElementType = cast<PointerType>(LHSType)->getPointeeType();
   uint64_t ElementSize = CGF.getContext().getTypeSize(LHSElementType,
                                                       SourceLocation()) / 8;
   

test/CodeGen/pointer-arithmetic.c

@@ -3,3 +3,5 @@
 typedef int Int;
 
 int test1(int *a, Int *b) { return a - b; }
+
+int test2(const char *a, char *b) { return b - a; }