fix compilation error with latest llvm 8.0 trunk (#1976)
In llvm/clang 8 trunk, the following commits https://reviews.llvm.org/rL339384 https://reviews.llvm.org/rL339385 https://reviews.llvm.org/rL339386 renames getLocStart to getBeginLoc, and getLocEnd to getEndLoc. This caused bcc compilation error with llvm/clang 8. To avoid proliferation of #define's based on LLVM version numbers and similar logic for many different types, this patch fixed the issues by define macros in common frontend_action_common.h where macro definition is multi-versioned based on llvm version. The macro itself is used in {b,tp}_frontend_action.cc. clang 8 also introduced a new library dependency libclangAnalysis.a depends on libclangASTMatchers.a This patch fixed this issue as well. Signed-off-by:Yonghong Song <yhs@fb.com>
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