[OpenCL] Fix assertion due to blocks

[OpenCL] Fix assertion due to blocks

A recent change caused assertion in CodeGenFunction::EmitBlockCallExpr when a block is called.

There is code

  Func = CGM.getOpenCLRuntime().getInvokeFunction(E->getCallee());
getCalleeDecl calls Expr::getReferencedDeclOfCallee, which does not handle
BlockExpr and returns nullptr, which causes isa to assert.

This patch fixes that.

Differential Revision: https://reviews.llvm.org/D58658

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@354893 91177308-0d34-0410-b5e6-96231b3b80d8