[llvm-bugs] [Bug 32087] New: llvm-cov export -format=html outputs json data without a warning

[via llvm-bugs]

http://bugs.llvm.org/show_bug.cgi?id=32087

            Bug ID: 32087
           Summary: llvm-cov export -format=html outputs json data without
                    a warning
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: pszona at gmail.com
                CC: llvm-bugs at lists.llvm.org

The result of both commands:

```
llvm-cov export a.out -instr-profile default.proftext --format=html
llvm-cov report a.out -instr-profile default.proftext --format=html
```

is always a json/txt file respectively.

Export should return with error complaining about bad format option value or
(at least) print a warning as report does.

Behavior of report and report should be consistent.

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