Clear the cache of nonstandard integer type to fix an issue with using bitcasts and optimizations

Author: antoyo

gcc/jit/dummy-frontend.c

@@ -592,6 +592,8 @@ jit_langhook_init (void)
   global_dc->begin_diagnostic = jit_begin_diagnostic;
   global_dc->end_diagnostic = jit_end_diagnostic;
 
+  clear_nonstandard_integer_type_cache ();
+
   build_common_tree_nodes (false);
 
   /* I don't know why this has to be done explicitly.  */

gcc/tree.c

@@ -6963,6 +6963,14 @@ build_reference_type (tree to_type)
   (HOST_BITS_PER_WIDE_INT > 64 ? HOST_BITS_PER_WIDE_INT : 64)
 static GTY(()) tree nonstandard_integer_type_cache[2 * MAX_INT_CACHED_PREC + 2];
 
+void clear_nonstandard_integer_type_cache (void)
+{
+  for (size_t i = 0 ; i < 2 * MAX_INT_CACHED_PREC + 2 ; i++)
+  {
+    nonstandard_integer_type_cache[i] = NULL;
+  }
+}
+
 /* Builds a signed or unsigned integer type of precision PRECISION.
    Used for C bitfields whose precision does not match that of
    built-in target types.  */

gcc/tree.h

@@ -5385,6 +5385,7 @@ extern bool real_minus_onep (const_tree);
 extern void init_ttree (void);
 extern void build_common_tree_nodes (bool);
 extern void build_common_builtin_nodes (void);
+extern void clear_nonstandard_integer_type_cache (void);
 extern tree build_nonstandard_integer_type (unsigned HOST_WIDE_INT, int);
 extern tree build_nonstandard_boolean_type (unsigned HOST_WIDE_INT);
 extern tree build_range_type (tree, tree, tree);