Merge pull request #12686 from dcci/unused2

[gardening] More unused variables/lambda captures. NFCI.

Author: dcci

lib/AST/GenericSignatureBuilder.cpp

@@ -6312,7 +6312,7 @@ void GenericSignatureBuilder::enumerateRequirements(
       Type otherSubjectType =
         getUnresolvedType(nextComponent.anchor, genericParams);
       deferredSameTypeRequirement =
-        [&f, subjectType, otherSubjectType, this, genericParams] {
+        [&f, subjectType, otherSubjectType, this] {
           f(RequirementKind::SameType, subjectType, otherSubjectType,
             RequirementSource::forAbstract(*this, otherSubjectType));
         };

lib/IDE/TypeReconstruction.cpp

@@ -476,7 +476,6 @@ static bool FindFirstNamedDeclWithKind(
       }
     }
   } else if (result._module) {
-    ModuleDecl::AccessPathTy access_path;
     SmallVector<ValueDecl *, 4> decls;
     if (priv_decl_id)
       result._module.lookupMember(

lib/Index/Index.cpp

@@ -1136,7 +1136,6 @@ bool IndexSwiftASTWalker::initFuncRefIndexSymbol(ValueDecl *D, SourceLoc Loc,
       ReceiverTy = MetaT->getInstanceType();
 
     if (auto TyD = ReceiverTy->getAnyNominal()) {
-      StringRef unused;
       if (addRelation(Info, (SymbolRoleSet) SymbolRole::RelationReceivedBy, TyD))
         return true;
       if (isDynamicCall(BaseE, D))