Report captured variables in input dumps and traces. For example: ``` $ cat check CHECK: hello [[WHAT:[a-z]+]] CHECK: goodbye [[WHAT]] $ FileCheck -dump-input=always -vv check < input |& tail -8 <<<<<< 1: hello world check:1'0 ^~~~~~~~~~~ check:1'1 ^~~~~ captured var "WHAT" 2: goodbye world check:2'0 ^~~~~~~~~~~~~ check:2'1 with "WHAT" equal to "world" >>>>>> $ FileCheck -dump-input=never -vv check < input check2:1:8: remark: CHECK: expected string found in input CHECK: hello [[WHAT:[a-z]+]] ^ <stdin>:1:1: note: found here hello world ^~~~~~~~~~~ <stdin>:1:7: note: captured var "WHAT" hello world ^~~~~ check2:2:8: remark: CHECK: expected string found in input CHECK: goodbye [[WHAT]] ^ <stdin>:2:1: note: found here goodbye world ^~~~~~~~~~~~~ <stdin>:2:1: note: with "WHAT" equal to "world" goodbye world ^ ``` Reviewed By: thopre Differential Revision: https://reviews.llvm.org/D83651
