Fix uninitialized member

Author: stevenfontanella

src/support/small_vector.h

@@ -30,26 +30,10 @@
 
 namespace wasm {
 
-// We don't understand this warning, only here and only on aarch64 and riscv64,
-// we suspect it's spurious so disabling for now.
-//
-// For context: https://github.com/WebAssembly/binaryen/issues/6311
-
-#if defined(__aarch64__)
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
-#endif
-
-// https://github.com/WebAssembly/binaryen/issues/6410
-#if defined(__riscv) && __riscv_xlen == 64
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wuninitialized"
-#endif
-
 template<typename T, size_t N> class SmallVector {
   // fixed-space storage
   size_t usedFixed = 0;
-  std::array<T, N> fixed;
+  std::array<T, N> fixed{};
 
   // flexible additional storage
   std::vector<T> flexible;