Ruby

[PRISM] Suppress compiler warnings

../prism_compile.c: In function ‘pm_compile_node’:
../compile.c:583:24: warning: ‘retry_end_l’ may be used uninitialized in this function [-Wmaybe-uninitialized]
583 | anchor->last->next = elem;
| ~~~~~~~~~~~~~~~~~~~^~~~~~
In file included from ../compile.c:14256:
../prism_compile.c:5796:16: note: ‘retry_end_l’ was declared here
5796 | LABEL *retry_end_l;
| ^~~~~~~~~~~
../compile.c:255:42: warning: ‘retry_label’ may be used uninitialized in this function [-Wmaybe-uninitialized]
255 | #define LABEL_REF(label) ((label)->refcnt++)
| ^~
In file included from ../compile.c:14256:
../prism_compile.c:5795:16: note: ‘retry_label’ was declared here
5795 | LABEL *retry_label;
| ^~~~~~~~~~~
../prism_compile.c:5919:52: warning: ‘previous_block’ may be used uninitialized in this function [-Wmaybe-uninitialized]
5919 | ISEQ_COMPILE_DATA(iseq)->current_block = previous_block;
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~