Help the static analyzer

Author: vchuravy

src/gc.c

@@ -3754,6 +3754,7 @@ static void *gc_perm_alloc_large(size_t sz, int zero, unsigned align, unsigned o
 #endif
     errno = last_errno;
     jl_may_leak(base);
+    assert(align > 0);
     unsigned diff = (offset - base) % align;
     return (void*)(base + diff);
 }

src/init.c

@@ -101,8 +101,13 @@ void jl_init_stack_limits(int ismaster, void **stack_lo, void **stack_hi)
     struct rlimit rl;
     getrlimit(RLIMIT_STACK, &rl);
     size_t stacksize = rl.rlim_cur;
+// We intentionally leak a stack address here core.StackAddressEscape
+#ifndef __clang_analyzer__
     *stack_hi = (void*)&stacksize;
     *stack_lo = (void*)((char*)*stack_hi - stacksize);
+#endif
+    *stack_hi = 0;
+    *stack_lo = 0;
 #endif
 }