Merge ctx and ngram into llvm, fix references

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-# AFL Context Sensitive Branch Coverage
-
-## What is this?
-
-This is an LLVM-based implementation of the context sensitive branch coverage.
-
-Basically every function gets its own ID and, every time when an edge is logged,
-all the IDs in the callstack are hashed and combined with the edge transition
-hash to augment the classic edge coverage with the information about the
-calling context.
-
-So if both function A and function B call a function C, the coverage
-collected in C will be different.
-
-In math the coverage is collected as follows:
-`map[current_location_ID ^ previous_location_ID >> 1 ^ hash_callstack_IDs] += 1`
-
-The callstack hash is produced XOR-ing the function IDs to avoid explosion with
-recursive functions.
-
-## Usage
-
-Set the `AFL_LLVM_INSTRUMENT=CTX` or `AFL_LLVM_CTX=1` environment variable.
-
-It is highly recommended to increase the MAP_SIZE_POW2 definition in
-config.h to at least 18 and maybe up to 20 for this as otherwise too
-many map collisions occur.
-
-## Caller Branch Coverage
-
-If the context sensitive coverage introduces too may collisions and becoming
-detrimental, the user can choose to augment edge coverage with just the
-called function ID, instead of the entire callstack hash.
-
-In math the coverage is collected as follows:
-`map[current_location_ID ^ previous_location_ID >> 1 ^ previous_callee_ID] += 1`
-
-Set the `AFL_LLVM_INSTRUMENT=CALLER` or `AFL_LLVM_CALLER=1` environment variable.