Make adjustments for LLVM-19

[linehill]

• Fixed LLVM passes for LLVM-19.

• Changed chipStar configuration to prefer llvm-spirv with version suffix which matches to the chosen LLVM (e.g. llvm-spirv-19).

• Update README and scripts/configure_llvm.sh.

• New in clang-19: clang's SPIR-V and HIPSPV toolchain picks llvm-spirv-XX (when found in PATH or installed alongside the clang binary) where XX matches to the clang's major version. This should resolve the llvm-spirv issue reported in Build fails on Ubuntu 24.04 #824.

TODOs before the PR is ready for landing:

• Make chipStar forks for LLVM 19.
• Wait until Add translation for Intrinsic::{atan,acos,asin,cosh,sinh,tanh} KhronosGroup/SPIRV-LLVM-Translator#2657 lands and is backported to llvm_release_190.

[pvelesko]

CMake Error at /home/pvelesko/space/chipStar/main/llvm-project/clang/CMakeLists.txt:211 (message):
  GCC_INSTALL_PREFIX is deprecated and will be removed.  Use configuration
  files (https://clang.llvm.org/docs/UsersManual.html#configuration-files)to
  specify the default --gcc-install-dir= or --gcc-triple=.  --gcc-toolchain=
  is discouraged.  See https://github.com/llvm/llvm-project/pull/77537 for
  detail.


-- Configuring incomplete, errors occurred!
See also "/home/pvelesko/space/chipStar/main/llvm-project/llvm/build_19/CMakeFiles/CMakeOutput.log".
See also "/home/pvelesko/space/chipStar/main/llvm-project/llvm/build_19/CMakeFiles/CMakeError.log".