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In input dump annotations, `check:2'1` indicates diagnostic 1 for the
`CHECK` directive on check file line 2. Without this patch,
`-dump-input` computes the diagnostic index with the assumption that
FileCheck *consecutively* produces all diagnostics for the same
pattern. Already, that can be a false assumption, as in the examples
below. Moreover, it seems like a brittle assumption as FileCheck
evolves. Finally, it actually complicates the implementation even if
it makes it slightly more efficient.
This patch avoids that assumption. Examples below show results after
applying this patch. Before applying this patch, `'N` is omitted
throughout these examples because the implementation doesn't notice
there's more than one diagnostic per pattern.
First, `CHECK-LABEL` violates the assumption because `CHECK-LABEL`
tries to match twice, and other directives can match in between:
```
$ cat check
CHECK: foobar
CHECK-LABEL: foobar
$ FileCheck -vv check < input |& tail -8
<<<<<<
1: text
2: foobar
label:2'0 ^~~~~~
check:1 ^~~~~~
label:2'1 X error: no match found
3: text
>>>>>>
```
Second, `--implicit-check-not` is obviously processed many times among
other directives:
```
$ cat check
CHECK: foo
CHECK: foo
$ FileCheck -vv -dump-input=always -implicit-check-not=foo \
check < input |& tail -16
<<<<<<
1: text
not:imp1'0 X~~~~
2: foo
check:1 ^~~
not:imp1'1 X
3: text
not:imp1'1 ~~~~~
4: foo
check:2 ^~~
not:imp1'2 X
5: text
not:imp1'2 ~~~~~
6:
eof:2 ^
>>>>>>
```
Reviewed By: thopre, jhenderson
Differential Revision: https://reviews.llvm.org/D97813
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