[CMake] Allow parametrizing of the static libraries in Cross ARM CMake cache. NFC. (#118737)

In order to support the cross-arm remote tests for LLDB project

(see 'lldb-remote-linux-*' public builders for details).

Author: vvereschaka

clang/cmake/caches/CrossWinToARMLinux.cmake

@@ -96,7 +96,11 @@ endif()
 if (NOT DEFINED TOOLCHAIN_SHARED_LIBS)
   set(TOOLCHAIN_SHARED_LIBS OFF)
 endif()
- 
+# Enable usage of the static libunwind and libc++abi libraries.
+if (NOT DEFINED TOOLCHAIN_USE_STATIC_LIBS)
+  set(TOOLCHAIN_USE_STATIC_LIBS ON)
+endif()
+
 if (NOT DEFINED LLVM_TARGETS_TO_BUILD)
   if ("${TOOLCHAIN_TARGET_TRIPLE}" MATCHES "^(armv|arm32)+")
     set(LLVM_TARGETS_TO_BUILD "ARM" CACHE STRING "")
@@ -206,7 +210,7 @@ set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBUNWIND_USE_COMPILER_RT
 set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBUNWIND_ENABLE_SHARED                   ${TOOLCHAIN_SHARED_LIBS} CACHE BOOL "")
 
 set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXXABI_USE_LLVM_UNWINDER               ON CACHE BOOL "")
-set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXXABI_ENABLE_STATIC_UNWINDER          ON CACHE BOOL "")
+set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXXABI_ENABLE_STATIC_UNWINDER          ${TOOLCHAIN_USE_STATIC_LIBS} CACHE BOOL "")
 set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXXABI_USE_COMPILER_RT                 ON CACHE BOOL "")
 set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXXABI_ENABLE_NEW_DELETE_DEFINITIONS   OFF CACHE BOOL "")
 set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXXABI_ENABLE_SHARED                   ${TOOLCHAIN_SHARED_LIBS} CACHE BOOL "")
@@ -217,7 +221,7 @@ set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXX_ABI_VERSION
 set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXX_CXX_ABI                            "libcxxabi" CACHE STRING "")    #!!!
 set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXX_ENABLE_NEW_DELETE_DEFINITIONS      ON CACHE BOOL "")
 # Merge libc++ and libc++abi libraries into the single libc++ library file.
-set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXX_ENABLE_STATIC_ABI_LIBRARY          ON CACHE BOOL "")
+set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXX_ENABLE_STATIC_ABI_LIBRARY          ${TOOLCHAIN_USE_STATIC_LIBS} CACHE BOOL "")
 # Forcely disable the libc++ benchmarks on Windows build hosts
 # (current benchmark test configuration does not support the cross builds there).
 if (WIN32)