swr: Fix build with llvm-10.0.

Fix build error after llvm-10.0 commit ("1b2842bf902a [Alignment][NFC] CreateMemSet use MaybeAlign").

../src/gallium/drivers/swr/swr_shader.cpp: In member function ‘void (* BuilderSWR::CompileGS(swr_context*, swr_jit_gs_key&))(HANDLE, HANDLE, SWR_GS_CONTEXT*)’: ../src/gallium/drivers/swr/swr_shader.cpp:738:65: error: no matching function for call to ‘BuilderSWR::MEMSET(llvm::Value*&, llvm::Constant*, int, long unsigned int)’ MEMSET(pStream, C((char)0), VERTEX_COUNT_SIZE + CONTROL_HEADER_SIZE, sizeof(float) * KNOB_SIMD_WIDTH); ^ In file included from ../src/gallium/drivers/swr/rasterizer/jitter/builder.h:163:0, from ../src/gallium/drivers/swr/swr_shader.cpp:43: src/gallium/drivers/swr/rasterizer/jitter/gen_builder.hpp:51:11: note: candidate: llvm::CallInst* SwrJit::Builder::MEMSET(llvm::Value*, llvm::Value*, uint64_t, llvm::MaybeAlign, bool, llvm::MDNode*, llvm::MDNode*, llvm::MDNode*) CallInst* MEMSET(Value Ptr, Value Val, uint64_t Size, MaybeAlign Align, bool isVolatile = false, MDNode TBAATag = nullptr, MDNode ScopeTag = nullptr, MDNode NoAliasTag = nullptr) ^ src/gallium/drivers/swr/rasterizer/jitter/gen_builder.hpp:51:11: note: no known conversion for argument 4 from ‘long unsigned int’ to ‘llvm::MaybeAlign’ In file included from ../src/gallium/drivers/swr/rasterizer/jitter/builder.h:163:0, from ../src/gallium/drivers/swr/swr_shader.cpp:43: src/gallium/drivers/swr/rasterizer/jitter/gen_builder.hpp:56:11: note: candidate: llvm::CallInst SwrJit::Builder::MEMSET(llvm::Value, llvm::Value, llvm::Value, llvm::MaybeAlign, bool, llvm::MDNode, llvm::MDNode*, llvm::MDNode*) CallInst* MEMSET(Value *Ptr, Value *Val, Value *Size, MaybeAlign Align, bool isVolatile = false, MDNode *TBAATag = nullptr, MDNode *ScopeTag = nullptr, MDNode *NoAliasTag = nullptr) ^ src/gallium/drivers/swr/rasterizer/jitter/gen_builder.hpp:56:11: note: no known conversion for argument 4 from ‘long unsigned int’ to ‘llvm::MaybeAlign’

Signed-off-by: Vinson Lee vlee@freedesktop.org