[include-fixer] Fix broken dependency shared build

Summary:
The shared build is broken (again).

To repro: [Release + Shared]
```
-DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=ON
```

Errors:
```
tools/clang/tools/extra/include-fixer/tool/CMakeFiles/clang-include-fixer.dir/ClangIncludeFixer.cpp.o: In function `(anonymous namespace)::includeFixerMain(int, char const**)':
ClangIncludeFixer.cpp:(.text._ZN12_GLOBAL__N_116includeFixerMainEiPPKc+0xbe9): undefined reference to `clang::find_all_symbols::SymbolInfo::SymbolInfo(llvm::StringRef, clang::find_all_symbols::SymbolInfo::SymbolKind, llvm::StringRef, int, std::vector<std::pair<clang::find_all_symbols::SymbolInfo::ContextType, std::string>, std::allocator<std::pair<clang::find_all_symbols::SymbolInfo::ContextType, std::string> > > const&)'
collect2: error: ld returned 1 exit status
```

```
tools/clang/tools/extra/unittests/include-fixer/CMakeFiles/IncludeFixerTests.dir/IncludeFixerTest.cpp.o: In function `clang::include_fixer::(anonymous namespace)::runIncludeFixer(llvm::StringRef, std::vector<std::string, std::allocator<std::string> > const&)':
IncludeFixerTest.cpp:(.text._ZN5clang13include_fixer12_GLOBAL__N_1L15runIncludeFixerEN4llvm9StringRefERKSt6vectorISsSaISsEE+0x10e): undefined reference to `clang::find_all_symbols::SymbolInfo::SymbolInfo(llvm::StringRef, clang::find_all_symbols::SymbolInfo::SymbolKind, llvm::StringRef, int, std::vector<std::pair<clang::find_all_symbols::SymbolInfo::ContextType, std::string>, std::allocator<std::pair<clang::find_all_symbols::SymbolInfo::ContextType, std::string> > > const&)'
IncludeFixerTest.cpp:(.text._ZN5clang13include_fixer12_GLOBAL__N_1L15runIncludeFixerEN4llvm9StringRefERKSt6vectorISsSaISsEE+0x1dc): undefined reference to `clang::find_all_symbols::SymbolInfo::SymbolInfo(llvm::StringRef, clang::find_all_symbols::SymbolInfo::SymbolKind, llvm::StringRef, int, std::vector<std::pair<clang::find_all_symbols::SymbolInfo::ContextType, std::string>, std::allocator<std::pair<clang::find_all_symbols::SymbolInfo::ContextType, std::string> > > const&)'
IncludeFixerTest.cpp:(.text._ZN5clang13include_fixer12_GLOBAL__N_1L15runIncludeFixerEN4llvm9StringRefERKSt6vectorISsSaISsEE+0x2f3): undefined reference to `clang::find_all_symbols::SymbolInfo::SymbolInfo(llvm::StringRef, clang::find_all_symbols::SymbolInfo::SymbolKind, llvm::StringRef, int, std::vector<std::pair<clang::find_all_symbols::SymbolInfo::ContextType, std::string>, std::allocator<std::pair<clang::find_all_symbols::SymbolInfo::ContextType, std::string> > > const&)'
IncludeFixerTest.cpp:(.text._ZN5clang13include_fixer12_GLOBAL__N_1L15runIncludeFixerEN4llvm9StringRefERKSt6vectorISsSaISsEE+0x40e): undefined reference to `clang::find_all_symbols::SymbolInfo::SymbolInfo(llvm::StringRef, clang::find_all_symbols::SymbolInfo::SymbolKind, llvm::StringRef, int, std::vector<std::pair<clang::find_all_symbols::SymbolInfo::ContextType, std::string>, std::allocator<std::pair<clang::find_all_symbols::SymbolInfo::ContextType, std::string> > > const&)'
IncludeFixerTest.cpp:(.text._ZN5clang13include_fixer12_GLOBAL__N_1L15runIncludeFixerEN4llvm9StringRefERKSt6vectorISsSaISsEE+0x526): undefined reference to `clang::find_all_symbols::SymbolInfo::SymbolInfo(llvm::StringRef, clang::find_all_symbols::SymbolInfo::SymbolKind, llvm::StringRef, int, std::vector<std::pair<clang::find_all_symbols::SymbolInfo::ContextType, std::string>, std::allocator<std::pair<clang::find_all_symbols::SymbolInfo::ContextType, std::string> > > const&)'
```

Reviewers: bkramer, hokein

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D20245

llvm-svn: 269441