…Make build

Add source file lists for AArch64, PowerPC, SystemZ, and RISCV targets
with their respective tablegen rules. Add missing LLVM libraries needed
for linking: CGData, ObjCARCOpts, IRPrinter, CFGuard, FrontendOpenMP,
FrontendOpenACC, FrontendOffloading, Coroutines, and SandboxIR. Also add
BLAKE3 sources to LLVMSupport and DWARF LowLevel sources to
LLVMDebugInfoDWARF.

Assisted-by: Claude Opus 4.6

When cross-compiling (e.g., ARM host building for x86_64), tablegen
tools must be built for the host system to be executable during the
build process. Previously, tablegen was built with the target sysroot,
making the binaries reference target system libraries that don't exist
on the host.

This commit:
- Detects cross-compilation via CMAKE_CROSSCOMPILING
- Uses ExternalProject_Add to build native tablegen without toolchain
- Copies GenVT.inc from native build to target build directory
- Updates tablegen macros to use LLVM_TABLEGEN_EXE variable

Fixes CI failures with error:
  x86_64-binfmt-P: Could not open '/lib64/ld-linux-x86-64.so.2'

Remove X86CompressEVEXTablesEmitter.cpp and X86ManualInstrMapping.cpp
from the native-tblgen source list - these files don't exist in
ClickHouse's LLVM fork.

…m_gen_vt

…tive-tblgen

- Use CMake variables in config.h.in for platform-specific defines
- Set HAVE_MALLINFO only on Linux with glibc (not musl/BSD/macOS)
- Set HAVE_GETAUXVAL only on Linux (it's Linux-specific)
- Set HAVE_MACH_MACH_H, HAVE_MALLOC_MALLOC_H for macOS
- Use st_mtimespec on macOS/FreeBSD, st_mtim on Linux
- Set HAVE_DECL_ARC4RANDOM on macOS/FreeBSD
- Use .dylib extension on macOS, .so elsewhere
- Apply same logic to native-tblgen using CMAKE_HOST_SYSTEM_NAME

- Disable HAVE_BACKTRACE on musl (no execinfo.h)
- Don't link with -ldl on musl (dlopen is in libc)
- Use USE_MUSL variable for proper detection

Assisted-by: Claude Opus 4.5 via GitHub Copilot

…nACC

Remove LLVM components that ClickHouse doesn't need:
- LLVMFrontendOpenACC library (and its tablegen commands)
- Architecture AsmParser libraries (all 5 targets)
- Architecture Disassembler libraries (all 5 targets)
- -gen-disassembler tablegen commands

This reduces build time and binary size without affecting functionality.

Assisted-by: Claude Opus 4.5 via GitHub Copilot

This reverts commit 2d1afc7.