Revert "[analyzer] Prevent misuses of -analyze-function"

This reverts commit 9d6a6159.

Exit Code: 1

Command Output (stderr):
--
/scratch/buildbot/bothome/clang-ve-ninja/llvm-project/clang/test/Analysis/analyze-function-guide.cpp:53:21: error: CHECK-EMPTY-NOT: excluded string found in input // CHECK-EMPTY-NOT: Every top-level function was skipped.
                    ^
<stdin>:1:1: note: found here
Every top-level function was skipped.
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Input file: <stdin>
Check file: /scratch/buildbot/bothome/clang-ve-ninja/llvm-project/clang/test/Analysis/analyze-function-guide.cpp

-dump-input=help explains the following input dump.

Input was:
<<<<<<
        1: Every top-level function was skipped.
not:53     !~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  error: no match expected
        2: Pass the -analyzer-display-progress for tracking which functions are analyzed.
>>>>>>