[PATCH] DW_OP_const* is invalid as a location

[Katya Romanova]

This is a fix for BZ #21776.
http://llvm.org/bugs/show_bug.cgi?id=21776

Before DW_OP_stack_value was introduced in DWARF4, llvm relied on heuristics to disambiguate the value vs. location status of the expression DW_OP_consts <const>.

The proper (compliant with DWARF) way to describe a location where a value is constant is "DW_OP_constu <const>, DW_OP_stack_value”.

The fix is simple. I pushed DW_OP_stack_value on the stack.



, DW_OP_consts <const> supposed to represent

http://reviews.llvm.org/D6568

Files:
  lib/CodeGen/AsmPrinter/DwarfDebug.cpp
  test/DebugInfo/incorrect-variable-debugloc1.ll
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