Avoid generation of dead code in a few more situations.

- Emit variable declarations as "simple", we want to avoid forcing the creation
   of a dummy basic block, but still need to make the variable available for
   later use.

 - With that, we can now skip IRgen for other unreachable statements (which
   don't define a label).

 - Anders, I added two fixmes on calls to EmitVLASize, can you check them?

llvm-svn: 76361

clang/lib/CodeGen/CodeGenFunction.cpp

@@ -450,19 +450,19 @@ void CodeGenFunction::EmitIndirectSwitches() {
   }         
 }
 
-llvm::Value *CodeGenFunction::GetVLASize(const VariableArrayType *VAT)
-{
+llvm::Value *CodeGenFunction::GetVLASize(const VariableArrayType *VAT) {
   llvm::Value *&SizeEntry = VLASizeMap[VAT];
   
   assert(SizeEntry && "Did not emit size for type");
   return SizeEntry;
 }
 
-llvm::Value *CodeGenFunction::EmitVLASize(QualType Ty)
-{
+llvm::Value *CodeGenFunction::EmitVLASize(QualType Ty) {
   assert(Ty->isVariablyModifiedType() &&
          "Must pass variably modified type to EmitVLASizes!");
   
+  EnsureInsertPoint();
+  
   if (const VariableArrayType *VAT = getContext().getAsVariableArrayType(Ty)) {
     llvm::Value *&SizeEntry = VLASizeMap[VAT];