[VE] Fix initializer visibility
Before the change attempt to link libLTO.so against shared
LLVM library failed as:
[ 76%] Linking CXX shared library ../../lib/libLTO.so ... /usr/bin/cmake -E cmake_link_script CMakeFiles/LTO.dir/link.txt --verbose=1 c++ -o ...libLTO.so.12git ...ibLLVM-12git.so ld: CMakeFiles/LTO.dir/lto.cpp.o: in function `llvm::InitializeAllTargetInfos()': include/llvm/Config/Targets.def:31: undefined reference to `LLVMInitializeVETargetInfo'
It happens because on linux llvm build system sets default
symbol visibility to "hidden". The fix is to set visibility
back to "default" for exported APIs with LLVM_EXTERNAL_VISIBILITY.
Reviewed By: simoll
Differential Revision: https://reviews.llvm.org/D89633