[VirtualInstruction] Remove assertion. NFC.

ScopStmt::contains is currently implemented on the basis of BasicBlock
and does not take the instruction list into account. Therefore any
instruction copied by -polly-optree into another statement currently
triggers that assertion.

Remove that assertion for now. We might re-enable it when the
implementation of ScopStmt::contains changes.

llvm-svn: 309421

polly/include/polly/Support/VirtualInstruction.h

@@ -242,8 +242,6 @@ public:
   VirtualInstruction(ScopStmt *Stmt, Instruction *Inst)
       : Stmt(Stmt), Inst(Inst) {
     assert(Stmt && Inst);
-    assert(Stmt->contains(Inst) &&
-           "A virtual instruction must be exist in that statement");
   }
 
   VirtualOperandIterator operand_begin() const {