[gn build] Port 8c5e9cf

Author: llvmgnsyncbot

llvm/utils/gn/secondary/clang/lib/AST/BUILD.gn

@@ -108,6 +108,7 @@ static_library("AST") {
     "Interp/InterpBlock.cpp",
     "Interp/InterpBuiltin.cpp",
     "Interp/InterpFrame.cpp",
+    "Interp/InterpShared.cpp",
     "Interp/InterpStack.cpp",
     "Interp/InterpState.cpp",
     "Interp/Pointer.cpp",