dbghelp: Add partial support for version 3 of DWARF CIEs which are generated by Clang/LLVM.

dlls/dbghelp/dwarf.c

@@ -2629,7 +2629,7 @@ static BOOL parse_cie_details(dwarf2_traverse_context_t* ctx, struct frame_info*
 
     /* parse the CIE first */
     version = dwarf2_parse_byte(ctx);
-    if (version != 1)
+    if (version != 1 && version != 3)
     {
         FIXME("unknown CIE version %u at %p\n", version, ctx->data - 1);
         return FALSE;
@@ -2639,7 +2639,10 @@ static BOOL parse_cie_details(dwarf2_traverse_context_t* ctx, struct frame_info*
 
     info->code_align = dwarf2_leb128_as_unsigned(ctx);
     info->data_align = dwarf2_leb128_as_signed(ctx);
-    info->retaddr_reg = dwarf2_parse_byte(ctx);
+    if (version == 1)
+        info->retaddr_reg = dwarf2_parse_byte(ctx);
+    else
+        info->retaddr_reg = dwarf2_leb128_as_unsigned(ctx);
     info->state.cfa_rule = RULE_CFA_OFFSET;
 
     end = NULL;