On 32-bit systems without JIT, the GC doesn't like 4-byte alignment,
so enforce a stricter one.

--- a/js/src/jit/none/MacroAssembler-none.h
+++ b/js/src/jit/none/MacroAssembler-none.h
@@ -100,7 +100,7 @@ static constexpr Register WasmTlsReg{Reg
 static constexpr Register WasmJitEntryReturnScratch{Registers::invalid_reg};
 
 static constexpr uint32_t ABIStackAlignment = 4;
-static constexpr uint32_t CodeAlignment = 16;
+static constexpr uint32_t CodeAlignment = 8;
 static constexpr uint32_t JitStackAlignment = 8;
 static constexpr uint32_t JitStackValueAlignment =
     JitStackAlignment / sizeof(Value);