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12c5f043b8
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