Replace uses of "java.base" string in the VM with JAVA_BASE_NAME macro for consistency, e.g.

src/share/vm/runtime/arguments.cpp: if (strcmp(module_name, "java.base") == 0) {

src/share/vm/classfile/classLoader.cpp: location = (*JImageFindResource)(_jimage, "java.base", get_jimage_version_s