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In DWARF expression handling, some operators are required to be either at the end of an expression or followed by a composition operator. So far only the operators DW_OP_reg0-31 were allowed to be followed by DW_OP_GNU_uninit instead, and particularly DW_OP_regx was not, which is obviously inconsistent. This patch allows DW_OP_GNU_uninit after all operators requiring a composition, to simplify the code and make it more consistent. This policy may be more permissive than necessary, but in the worst case just leads to a DWARF location description resulting in an uninitialized value instead of an error message. gdb/ChangeLog: * dwarf2expr.c (dwarf_expr_require_composition): Allow DW_OP_GNU_uninit. (execute_stack_op): Use dwarf_expr_require_composition instead of copying its logic.
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