Fix ub

Author: cor3ntin

clang/include/clang/Sema/Sema.h

@@ -13173,7 +13173,9 @@ class Sema final : public SemaBase {
     CodeSynthesisContext()
         : Kind(TemplateInstantiation),
           SavedInNonInstantiationSFINAEContext(false),
-          InConstraintSubstitution(false), Entity(nullptr), Template(nullptr),
+          InConstraintSubstitution(false),
+          InParameterMappingSubstitution(false),
+          Entity(nullptr), Template(nullptr),
           TemplateArgs(nullptr), NumTemplateArgs(0), DeductionInfo(nullptr) {}
 
     /// Determines whether this template is an actual instantiation

clang/lib/Sema/SemaConcept.cpp

@@ -1157,7 +1157,7 @@ bool Sema::CheckConstraintSatisfaction(
   if (::CheckConstraintSatisfaction(
           *this, Template, AssociatedConstraints, TemplateArgsLists,
           TemplateIDRange, *Satisfaction, ConvertedExpr, TopLevelConceptId)) {
-    OutSatisfaction = *Satisfaction;
+    OutSatisfaction = std::move(*Satisfaction);
     return true;
   }
 

clang/lib/Sema/SemaTemplateInstantiate.cpp

@@ -2804,7 +2804,6 @@ TemplateInstantiator::TransformNestedRequirement(
   ASTContext &C = SemaRef.Context;
 
   Expr *Constraint = Req->getConstraintExpr();
-  ExprResult TransConstraint = Constraint;
   ConstraintSatisfaction Satisfaction;
 
   auto NestedReqWithDiag = [&C, this](Expr *E,