Replaced two instances of std::function with auto.

Thanks to Zachary Turner for the suggestion.  It's distasteful that the actual
type of the lambda can't be spelled out, but it should be evident from the
definition of the lambda body.

llvm-svn: 281536

Author: scallanan

lldb/source/Expression/DWARFExpression.cpp

@@ -3335,10 +3335,9 @@ bool DWARFExpression::MatchesOperand(StackFrame &frame,
       return false;
     }
 
-    std::function<bool(const Instruction::Operand &)> recurse =
-        [&frame, fb_expr](const Instruction::Operand &child) {
-          return fb_expr->MatchesOperand(frame, child);
-        };
+    auto recurse = [&frame, fb_expr](const Instruction::Operand &child) {
+      return fb_expr->MatchesOperand(frame, child);
+    };
 
     if (!offset &&
         MatchUnaryOp(MatchOpType(Instruction::Operand::Type::Dereference),

lldb/source/Target/StackFrame.cpp

@@ -1608,10 +1608,9 @@ lldb::ValueObjectSP DoGuessValueAt(StackFrame &frame, ConstString reg,
     }
 
     Instruction::Operand *origin_operand = nullptr;
-    std::function<bool(const Instruction::Operand &)> clobbered_reg_matcher =
-        [reg_info](const Instruction::Operand &op) {
-          return MatchRegOp(*reg_info)(op) && op.m_clobbered;
-        };
+    auto clobbered_reg_matcher = [reg_info](const Instruction::Operand &op) {
+      return MatchRegOp(*reg_info)(op) && op.m_clobbered;
+    };
 
     if (clobbered_reg_matcher(operands[0])) {
       origin_operand = &operands[1];