[gn build] Port 1a46229

Author: llvmgnsyncbot

llvm/utils/gn/secondary/llvm/lib/Target/WebAssembly/BUILD.gn

@@ -37,6 +37,7 @@ static_library("LLVMWebAssemblyCodeGen") {
     "WebAssemblyAsmPrinter.cpp",
     "WebAssemblyCFGSort.cpp",
     "WebAssemblyCFGStackify.cpp",
+    "WebAssemblyCleanCodeAfterTrap.cpp",
     "WebAssemblyDebugFixup.cpp",
     "WebAssemblyDebugValueManager.cpp",
     "WebAssemblyExceptionInfo.cpp",