[analyzer] Support inlining lambda-converted blocks.

[analyzer] Support inlining lambda-converted blocks.

clang converts C++ lambdas to blocks with an implicit user-defined conversion
operator method on the lambda record. This method returns a block that captures a copy
of the lambda. To inline a lambda-converted block, the analyzer now calls the lambda
records's call operator method on the lambda captured by the block.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@254702 91177308-0d34-0410-b5e6-96231b3b80d8