Add a GitHub team to subscribe to WebAssembly backend (llvm#65419)

This also includes some files related to the Wasm binary and object file
format (which is technically distinct from the WebAssembly architecture,
but practically inseparable).

Author: dschuff

.github/CODEOWNERS

@@ -592,3 +592,28 @@ utils/bazel/llvm-project-overlay/libc/** @llvm/pr-subscribers-libc
 /llvm/tools/llvm-exegesis/ @llvm/pr-subscribers-exegesis
 /llvm/test/tools/llvm-exegesis/ @llvm/pr-subscribers-exegesis
 /llvm/unittests/tools/llvm-exegesis/ @llvm/pr-subscribers-exegesis
+
+# WebAssembly
+/llvm/include/llvm/BinaryFormat/Wasm.h @llvm/pr-subscribers-webassembly
+/llvm/include/llvm/IR/IntinsicsWebAssembly.td @llvm/pr-subscribers-webassembly
+/llvm/include/llvm/Object/Wasm* @llvm/pr-subscribers-webassembly
+/llvm/lib/CodeGen/Wasm* @llvm/pr-subscribers-webassembly
+/llvm/lib/CodeGen/AsmPrinter/Wasm* @llvm/pr-subscribers-webassembly
+/llvm/lib/MC/MCParser/Wasm* @llvm/pr-subscribers-webassembly
+/llvm/lib/MC/Wasm* @llvm/pr-subscribers-webassembly
+/llvm/lib/ObjCopy/wasm/ @llvm/pr-subscribers-webassembly
+/llvm/lib/Object/Wasm* @llvm/pr-subscribers-webassembly
+/llvm/lib/Target/WebAssembly/ @llvm/pr-subscribers-webassembly
+/llvm/test/CodeGen/WebAssembly/ @llvm/pr-subscribers-webassembly
+/llvm/test/DebugInfo/WebAssembly/ @llvm/pr-subscribers-webassembly
+/llvm/test/MC/WebAssembly/ @llvm/pr-subscribers-webassembly
+/llvm/unittests/Target/WebAssembly/ @llvm/pr-subscribers-webassembly
+/clang/include/clang/Basic/BuiltinsWebAssembly.def @llvm/pr-subscribers-webassembly
+/clang/include/clang/Basic/WebAssemblyReferenceTypes.def @llvm/pr-subscribers-webassembly
+/clang/lib/Basic/Targets/WebAssembly* @llvm/pr-subscribers-webassembly
+/clang/lib/Driver/Toolchains/WebAssembly* @llvm/pr-subscribers-webassembly
+/clang/lib/CodeGen/Targets/WebAssembly* @llvm/pr-subscribers-webassembly
+/clang/lib/Headers/wasm_simd128.h @llvm/pr-subscribers-webassembly
+/clang/test/CodeGen/WebAssembly/ @llvm/pr-subscribers-webassembly
+/clang/test/Sema/*wasm* @llvm/pr-subscribers-webassembly
+/clang/test/SemaCXX/*wasm* @llvm/pr-subscribers-webassembly