message: build: increase wee8's VSZ limit to 4TB.
  This allows us to start up to 370 VMs.
  Fixes
diff: # 2. Fix build with -DDEBUG.
  # 3. Fix for VMs with overlapping lifetimes (https://crrev.com/c/1698387).
  # 4. Fix linking with unbundled toolchain on macOS.
  +# 5. Increase VSZ limit to 4TiB (allows us to start up to 370 VMs).
  --- a/wee8/build/toolchain/gcc_toolchain.gni
  +++ b/wee8/build/toolchain/gcc_toolchain.gni
  @@ -355,6 +355,8 @@ template("gcc_toolchain") {
  store->context()->Enter();
  isolate->SetData(0, store.get());
  +--- a/wee8/src/wasm/wasm-memory.cc
  ++++ b/wee8/src/wasm/wasm-memory.cc
  +@@ -139,7 +139,7 @@ void* TryAllocateBackingStore(WasmMemoryTracker* memory_tracker, Heap* heap,
  + // address space limits needs to be smaller.
  + constexpr size_t kAddressSpaceLimit = 0x8000000000L; // 512 GiB
  + #elif V8_TARGET_ARCH_64_BIT
  +-constexpr size_t kAddressSpaceLimit = 0x10100000000L; // 1 TiB + 4 GiB
  ++constexpr size_t kAddressSpaceLimit = 0x40100000000L; // 4 TiB + 4 GiB
  + #else
  + constexpr size_t kAddressSpaceLimit = 0xC0000000; // 3 GiB
  + #endif
  --- a/wee8/third_party/wasm-api/wasm.hh
  +++ b/wee8/third_party/wasm-api/wasm.hh
  @@ -111,7 +111,7 @@ class vec {
  