Keep allocas at the start of the function

[Flakebi]

All inserted code should come after allocas. If an alloca ends up outside of the entry block, LLVM consideres it dynamically allocated stack and the scratch size in PAL metadata does not include it anymore.

Fixes dEQP-VK.subgroups.ballot_broadcast.mesh.subgroupbroadcast_dvec2_mesh in combination with D150609.

[amdvlk-admin]

Test summary for commit 7fb3a2c

CTS tests (Failed: 0/140881)

• Built with version 1.3.3.1
Ubuntu 22.04, Navi3x
• Passed: 39058/70446 (55.4%)
• Failed: 0/70446 (0.0%)
• Not Supported: 31388/70446 (44.6%)
• Warnings: 0/70446 (0.0%)
Ubuntu 20.04, Navi2x
• Passed: 39090/70435 (55.5%)
• Failed: 0/70435 (0.0%)
• Not Supported: 31345/70435 (44.5%)
• Warnings: 0/70435 (0.0%)

[amdvlk-admin]

7fb3a2c Jenkins build error.
/jenkins/workspace/vulkan/sanitized-opensource/Github-PR/llpc-github-pr/driver_build/drivers/xgl/icd/api/pipeline_compiler.cpp:3200:65: error: ‘Vkgc::LlpcRaytracingMode’ has not been declared
3200 | static_assert(RaytracingNone == static_cast(Vkgc::LlpcRaytracingMode::None));
| ^~~~~~~~~~~~~~~~~~
/jenkins/workspace/vulkan/sanitized-opensource/Github-PR/llpc-github-pr/driver_build/drivers/xgl/icd/api/pipeline_compiler.cpp:3201:67: error: ‘Vkgc::LlpcRaytracingMode’ has not been declared
3201 | static_assert(RaytracingLegacy == static_cast(Vkgc::LlpcRaytracingMode::Legacy));
| ^~~~~~~~~~~~~~~~~~
/jenkins/workspace/vulkan/sanitized-opensource/Github-PR/llpc-github-pr/driver_build/drivers/xgl/icd/api/pipeline_compiler.cpp:3202:71: error: ‘Vkgc::LlpcRaytracingMode’ has not been declared
3202 | static_assert(RaytracingRefactored == static_cast(Vkgc::LlpcRaytracingMode::Gpurt2));
| ^~~~~~~~~~~~~~~~~~
/jenkins/workspace/vulkan/sanitized-opensource/Github-PR/llpc-github-pr/driver_build/drivers/xgl/icd/api/pipeline_compiler.cpp:3203:31: error: ‘struct Vkgc::RayTracingPipelineBuildInfo’ has no member named ‘mode’
3203 | pCreateInfo->pipelineInfo.mode = static_castVkgc::LlpcRaytracingMode(settings.llpcRaytracingMode);
| ^~~~
/jenkins/workspace/vulkan/sanitized-opensource/Github-PR/llpc-github-pr/driver_build/drivers/xgl/icd/api/pipeline_compiler.cpp:3203:56: error: ‘LlpcRaytracingMode’ in namespace ‘Vkgc’ does not name a type
3203 | pCreateInfo->pipelineInfo.mode = static_castVkgc::LlpcRaytracingMode(settings.llpcRaytracingMode);
| ^~~~~~~~~~~~~~~~~~
[3023/3086] Building CXX object icd/CMakeFiles/xgl.dir/api/vk_descriptor_set_layout.cpp.o
[3024/3086] Building CXX object icd/CMakeFiles/xgl.dir/api/vk_cmd_pool.cpp.o
[3025/3086] Building CXX object icd/CMakeFiles/xgl.dir/api/vk_compute_pipeline.cpp.o