[llvm] [LLVM][Support] Add options to control DAG graph dumps (PR #214314)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Linux-->
# :penguin: Linux x64 Test Results

The build failed before running any tests. Click on a failure below to see the details.

<details>
<summary>lib/Support/CMakeFiles/LLVMSupport.dir/GraphWriter.cpp.o</summary>

```
FAILED: lib/Support/CMakeFiles/LLVMSupport.dir/GraphWriter.cpp.o
sccache /opt/llvm/bin/clang++ -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_USE_CXX11_ABI=1 -D_GNU_SOURCE -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/gha/actions-runner/_work/llvm-project/llvm-project/build/lib/Support -I/home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/lib/Support -I/home/gha/actions-runner/_work/llvm-project/llvm-project/build/include -I/home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/include -I/home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/../third-party/siphash/include -I/home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/../libc -gmlt -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Werror=global-constructors -O3 -DNDEBUG -std=c++17 -UNDEBUG -fno-exceptions -funwind-tables -fno-rtti -Wno-c99-extensions -MD -MT lib/Support/CMakeFiles/LLVMSupport.dir/GraphWriter.cpp.o -MF lib/Support/CMakeFiles/LLVMSupport.dir/GraphWriter.cpp.o.d -o lib/Support/CMakeFiles/LLVMSupport.dir/GraphWriter.cpp.o -c /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/lib/Support/GraphWriter.cpp
/home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/lib/Support/GraphWriter.cpp:49:14: error: declaration requires a global constructor [-Werror,-Wglobal-constructors]
49 | static bool *ViewBackground = []() {
|              ^                ~~~~~~
50 |   static bool b = false;
|   ~~~~~~~~~~~~~~~~~~~~~~
51 |   return &b;
|   ~~~~~~~~~~
52 | }(); // Dummy
| ~~~
1 error generated.
```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/214314