[clang] [llvm] [clang-sycl-linker] Add per-kernel device code splitting (PR #195362)

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github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Windows-->
# :window: Windows x64 Test Results

* 83486 tests passed
* 2079 tests skipped

All executed tests passed, but another part of the build **failed**. Click on a failure below to see the details.

<details>
<summary>[code=1] tools/clang/tools/clang-sycl-linker/CMakeFiles/clang-sycl-linker.dir/ClangSYCLLinker.cpp.obj</summary>

```
FAILED: [code=1] tools/clang/tools/clang-sycl-linker/CMakeFiles/clang-sycl-linker.dir/ClangSYCLLinker.cpp.obj
sccache C:\clang\clang-msvc\bin\clang-cl.exe  /nologo -TP -DCLANG_BUILD_STATIC -DLLVM_BUILD_STATIC -DUNICODE -D_CRT_NONSTDC_NO_DEPRECATE -D_CRT_NONSTDC_NO_WARNINGS -D_CRT_SECURE_NO_DEPRECATE -D_CRT_SECURE_NO_WARNINGS -D_GLIBCXX_ASSERTIONS -D_HAS_EXCEPTIONS=0 -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE -D_SCL_SECURE_NO_DEPRECATE -D_SCL_SECURE_NO_WARNINGS -D_UNICODE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -IC:\_work\llvm-project\llvm-project\build\tools\clang\tools\clang-sycl-linker -IC:\_work\llvm-project\llvm-project\clang\tools\clang-sycl-linker -IC:\_work\llvm-project\llvm-project\clang\include -IC:\_work\llvm-project\llvm-project\build\tools\clang\include -IC:\_work\llvm-project\llvm-project\build\include -IC:\_work\llvm-project\llvm-project\llvm\include /DWIN32 /D_WINDOWS   /Zc:inline /Zc:__cplusplus /Oi /Brepro /bigobj /permissive- -Werror=unguarded-availability-new /W4  -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -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 /Gw /O2 /Ob2  -std:c++17 -MD -UNDEBUG /EHs-c- /GR- /showIncludes /Fotools\clang\tools\clang-sycl-linker\CMakeFiles\clang-sycl-linker.dir\ClangSYCLLinker.cpp.obj /Fdtools\clang\tools\clang-sycl-linker\CMakeFiles\clang-sycl-linker.dir\ -c -- C:\_work\llvm-project\llvm-project\clang\tools\clang-sycl-linker\ClangSYCLLinker.cpp
In file included from C:\_work\llvm-project\llvm-project\clang\tools\clang-sycl-linker\ClangSYCLLinker.cpp:21:
In file included from C:\_work\llvm-project\llvm-project\llvm\include\llvm/ADT/StringExtras.h:18:
In file included from C:\_work\llvm-project\llvm-project\llvm\include\llvm/ADT/ArrayRef.h:14:
C:\_work\llvm-project\llvm-project\llvm\include\llvm/ADT/SmallVector.h(1189,7): error: static assertion failed due to requirement 'sizeof((anonymous namespace)::SplitModule) <= 256': You are trying to use a default number of inlined elements for `SmallVector<T>` but `sizeof(T)` is really big! Please use an explicit number of inlined elements with `SmallVector<T, N>` to make sure you really want that much inline storage.
1189 |       sizeof(T) <= 256,
|       ^~~~~~~~~~~~~~~~
C:\_work\llvm-project\llvm-project\llvm\include\llvm/ADT/SmallVector.h(1221,24): note: in instantiation of template class 'llvm::CalculateSmallVectorDefaultInlinedElements<(anonymous namespace)::SplitModule>' requested here
1221 |           unsigned N = CalculateSmallVectorDefaultInlinedElements<T>::value>
|                        ^
C:\_work\llvm-project\llvm-project\clang\tools\clang-sycl-linker\ClangSYCLLinker.cpp(515,17): note: in instantiation of default argument for 'SmallVector<SplitModule>' required here
515 | static Expected<SmallVector<SplitModule>>
|                 ^~~~~~~~~~~~~~~~~~~~~~~~
C:\_work\llvm-project\llvm-project\llvm\include\llvm/ADT/SmallVector.h(1189,17): note: expression evaluates to '304 <= 256'
1189 |       sizeof(T) <= 256,
|       ~~~~~~~~~~^~~~~~
C:\_work\llvm-project\llvm-project\clang\tools\clang-sycl-linker\ClangSYCLLinker.cpp(567,12): error: no viable conversion from returned value of type 'Error' to function return type 'int'
567 |     return Err;
|            ^~~
C:\_work\llvm-project\llvm-project\clang\tools\clang-sycl-linker\ClangSYCLLinker.cpp(624,14): error: call to deleted constructor of 'Error'
624 |       return Err;
|              ^~~
C:\_work\llvm-project\llvm-project\llvm\include\llvm/Support/Error.h(191,3): note: 'Error' has been explicitly marked deleted here
191 |   Error(const Error &Other) = delete;
|   ^
3 errors 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/195362