Change the DWARFExpression::Evaluate methods to take an optional
RegisterContext* - normally this is retrieved from the ExecutionContext's
StackFrame but when we need to evaluate an expression while creating
the stack frame list this can be a little tricky.

Add DW_OP_deref_size, needed for the _sigtramp FDE expression.

Add support for processing DWARF expressions in RegisterContextLLDB.

Update callers to DWARFExpression::Evaluate.



git-svn-id: https://llvm.org/svn/llvm-project/llvdb/trunk@119885 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/source/Expression/ClangExpressionDeclMap.cpp b/source/Expression/ClangExpressionDeclMap.cpp
index 0775b4f..f2d2bc9 100644
--- a/source/Expression/ClangExpressionDeclMap.cpp
+++ b/source/Expression/ClangExpressionDeclMap.cpp
@@ -1205,7 +1205,7 @@
     }
     Error err;
     
-    if (!var_location_expr.Evaluate(&exe_ctx, exe_ast_ctx, loclist_base_load_addr, NULL, *var_location.get(), &err))
+    if (!var_location_expr.Evaluate(&exe_ctx, exe_ast_ctx, NULL, loclist_base_load_addr, NULL, *var_location.get(), &err))
     {
         if (log)
             log->Printf("Error evaluating location: %s", err.AsCString());