[llvm] Move DroppedVariableStats to CodeGen lib (PR #120650)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-aarch64-sve2-vla` running on `linaro-g4-02` while building `llvm` at step 7 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/198/builds/403

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 7 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'libFuzzer-aarch64-default-Linux :: reduce_inputs.test' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 3: rm -rf /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/AARCH64DefaultLinuxConfig/Output/reduce_inputs.test.tmp/C
+ rm -rf /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/AARCH64DefaultLinuxConfig/Output/reduce_inputs.test.tmp/C
RUN: at line 4: mkdir -p /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/AARCH64DefaultLinuxConfig/Output/reduce_inputs.test.tmp/C
+ mkdir -p /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/AARCH64DefaultLinuxConfig/Output/reduce_inputs.test.tmp/C
RUN: at line 5: /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/./bin/clang    -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta   --driver-mode=g++ -O2 -gline-tables-only -fsanitize=address,fuzzer -I/home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/compiler-rt/lib/fuzzer  -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta  /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/compiler-rt/test/fuzzer/ShrinkControlFlowSimpleTest.cpp -o /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/AARCH64DefaultLinuxConfig/Output/reduce_inputs.test.tmp-ShrinkControlFlowSimpleTest
+ /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/./bin/clang -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta --driver-mode=g++ -O2 -gline-tables-only -fsanitize=address,fuzzer -I/home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/compiler-rt/lib/fuzzer -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/compiler-rt/test/fuzzer/ShrinkControlFlowSimpleTest.cpp -o /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/AARCH64DefaultLinuxConfig/Output/reduce_inputs.test.tmp-ShrinkControlFlowSimpleTest
RUN: at line 6: /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/./bin/clang    -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta   --driver-mode=g++ -O2 -gline-tables-only -fsanitize=address,fuzzer -I/home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/compiler-rt/lib/fuzzer  -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta  /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/compiler-rt/test/fuzzer/ShrinkControlFlowTest.cpp -o /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/AARCH64DefaultLinuxConfig/Output/reduce_inputs.test.tmp-ShrinkControlFlowTest
+ /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/./bin/clang -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta --driver-mode=g++ -O2 -gline-tables-only -fsanitize=address,fuzzer -I/home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/compiler-rt/lib/fuzzer -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/compiler-rt/test/fuzzer/ShrinkControlFlowTest.cpp -o /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/AARCH64DefaultLinuxConfig/Output/reduce_inputs.test.tmp-ShrinkControlFlowTest
RUN: at line 7: /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/AARCH64DefaultLinuxConfig/Output/reduce_inputs.test.tmp-ShrinkControlFlowSimpleTest  -exit_on_item=0eb8e4ed029b774d80f2b66408203801cb982a60   -runs=1000000 /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/AARCH64DefaultLinuxConfig/Output/reduce_inputs.test.tmp/C 2>&1 | FileCheck /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/compiler-rt/test/fuzzer/reduce_inputs.test
+ /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/AARCH64DefaultLinuxConfig/Output/reduce_inputs.test.tmp-ShrinkControlFlowSimpleTest -exit_on_item=0eb8e4ed029b774d80f2b66408203801cb982a60 -runs=1000000 /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/AARCH64DefaultLinuxConfig/Output/reduce_inputs.test.tmp/C
+ FileCheck /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/compiler-rt/test/fuzzer/reduce_inputs.test
/home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/compiler-rt/test/fuzzer/reduce_inputs.test:8:8: error: CHECK: expected string not found in input
CHECK: INFO: found item with checksum '0eb8e4ed029b774d80f2b66408203801cb982a60'
       ^
<stdin>:1:1: note: scanning from here
INFO: Running with entropic power schedule (0xFF, 100).
^

Input file: <stdin>
Check file: /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/compiler-rt/test/fuzzer/reduce_inputs.test

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

Input was:
<<<<<<
         1: INFO: Running with entropic power schedule (0xFF, 100). 
check:8     X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
         2: INFO: Seed: 2507643679 
check:8     ~~~~~~~~~~~~~~~~~~~~~~~
         3: INFO: Loaded 1 modules (6 inline 8-bit counters): 6 [0xc9176c290ea0, 0xc9176c290ea6),  
check:8     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         4: INFO: Loaded 1 PC tables (6 PCs): 6 [0xc9176c290ea8,0xc9176c290f08),  
check:8     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         5: INFO: 0 files found in /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/AARCH64DefaultLinuxConfig/Output/reduce_inputs.test.tmp/C 
check:8     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         6: INFO: -max_len is not provided; libFuzzer will not generate inputs larger than 4096 bytes 
check:8     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         .
         .
         .
>>>>>>

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/120650