search for: r289087

...tml) about the motivation for the change. ## LLVM commits * The logic in FileCheck for finding check prefixes in the input file has been reimplemented to be more efficient. [r289382](http://reviews.llvm.org/rL289382). * `!absolute_symbol` metadata was introduced and is used by the X86 backend. [r289087](http://reviews.llvm.org/rL285806). * The lit testing tool now supports custom parsers, which can be used to recognise new keywords beyond RUN, REQUIRES etc. [r288694](http://reviews.llvm.org/rL288694). * The performance of LowerTypeTests was improved. This reduces the pass runtime on a module co...