[lldb][DWARFExpression] Fix DW_OP_div to use signed division

This patch resolves an issue where a value
is incorrectly displayed if it is represented
by DW_OP_div.

This issue is caused by lldb evaluating
operands of DW_OP_div as unsigned
and performed unintended unsigned
division.

This issue is resolved by creating two
temporary signed scalar and performing
signed division.

(Addresses GH#61727)

Differential Revision: https://reviews.llvm.org/D147370

Author: jwnhy

lldb/source/Expression/DWARFExpression.cpp

@@ -1436,8 +1436,12 @@ bool DWARFExpression::Evaluate(
           return false;
         } else {
           stack.pop_back();
-          stack.back() =
-              stack.back().ResolveValue(exe_ctx) / tmp.ResolveValue(exe_ctx);
+          Scalar divisor, dividend;
+          divisor = tmp.ResolveValue(exe_ctx);
+          dividend = stack.back().ResolveValue(exe_ctx);
+          divisor.MakeSigned();
+          dividend.MakeSigned();
+          stack.back() = dividend / divisor;
           if (!stack.back().ResolveValue(exe_ctx).IsValid()) {
             if (error_ptr)
               error_ptr->SetErrorString("Divide failed.");