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/Target/StackFrame.cpp b/source/Target/StackFrame.cpp
index 7671eab..7281ba4 100644
--- a/source/Target/StackFrame.cpp
+++ b/source/Target/StackFrame.cpp
@@ -496,7 +496,7 @@
             if (m_sc.function->GetFrameBaseExpression().IsLocationList())
                 loclist_base_addr = m_sc.function->GetAddressRange().GetBaseAddress().GetLoadAddress (&m_thread.GetProcess().GetTarget());
 
-            if (m_sc.function->GetFrameBaseExpression().Evaluate(&exe_ctx, NULL, loclist_base_addr, NULL, expr_value, &m_frame_base_error) == false)
+            if (m_sc.function->GetFrameBaseExpression().Evaluate(&exe_ctx, NULL, NULL, loclist_base_addr, NULL, expr_value, &m_frame_base_error) == false)
             {
                 // We should really have an error if evaluate returns, but in case
                 // we don't, lets set the error to something at least.