[Sema][NFC] Remove some unnecessary calls to getASTContext.

The AST context is already easily available. NFC.

llvm-svn: 349904
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index 9fe65c1..b9284a5 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -5148,8 +5148,6 @@
     TheCall->setArg(i+1, Arg.get());
   }
 
-  ASTContext& Context = this->getASTContext();
-
   // Create a new DeclRefExpr to refer to the new decl.
   DeclRefExpr* NewDRE = DeclRefExpr::Create(
       Context,
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 6dab332..80cafbe 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -5875,10 +5875,10 @@
   return true;
 }
 
-static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) {
+static void SetNestedNameSpecifier(Sema &S, DeclaratorDecl *DD, Declarator &D) {
   CXXScopeSpec &SS = D.getCXXScopeSpec();
   if (!SS.isSet()) return;
-  DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext()));
+  DD->setQualifierInfo(SS.getWithLocInContext(S.Context));
 }
 
 bool Sema::inferObjCARCLifetime(ValueDecl *decl) {
@@ -6583,7 +6583,7 @@
         NewTemplate->setInvalidDecl();
     }
 
-    SetNestedNameSpecifier(NewVD, D);
+    SetNestedNameSpecifier(*this, NewVD, D);
 
     // If we have any template parameter lists that don't directly belong to
     // the variable (matching the scope specifier), store them.
@@ -8384,7 +8384,7 @@
         Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_in_union);
     }
 
-    SetNestedNameSpecifier(NewFD, D);
+    SetNestedNameSpecifier(*this, NewFD, D);
     isMemberSpecialization = false;
     isFunctionTemplateSpecialization = false;
     if (D.isInvalidType())
diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 041ecc9..78dbf43 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -16547,7 +16547,7 @@
       DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E);
       if (DRE && Proto && Proto->getParamTypes().empty() && Proto->isVariadic()) {
         SourceLocation Loc = FD->getLocation();
-        FunctionDecl *NewFD = FunctionDecl::Create(FD->getASTContext(),
+        FunctionDecl *NewFD = FunctionDecl::Create(S.Context,
                                       FD->getDeclContext(),
                                       Loc, Loc, FD->getNameInfo().getName(),
                                       DestType, FD->getTypeSourceInfo(),
diff --git a/clang/lib/Sema/SemaTemplate.cpp b/clang/lib/Sema/SemaTemplate.cpp
index e0f4d2e..2d2d08f 100644
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -1255,9 +1255,10 @@
       RAngleLoc, RequiresClause);
 }
 
-static void SetNestedNameSpecifier(TagDecl *T, const CXXScopeSpec &SS) {
+static void SetNestedNameSpecifier(Sema &S, TagDecl *T,
+                                   const CXXScopeSpec &SS) {
   if (SS.isSet())
-    T->setQualifierInfo(SS.getWithLocInContext(T->getASTContext()));
+    T->setQualifierInfo(SS.getWithLocInContext(S.Context));
 }
 
 DeclResult Sema::CheckClassTemplate(
@@ -1554,7 +1555,7 @@
                           PrevClassTemplate && ShouldAddRedecl ?
                             PrevClassTemplate->getTemplatedDecl() : nullptr,
                           /*DelayTypeCreation=*/true);
-  SetNestedNameSpecifier(NewClass, SS);
+  SetNestedNameSpecifier(*this, NewClass, SS);
   if (NumOuterTemplateParamLists > 0)
     NewClass->setTemplateParameterListsInfo(
         Context, llvm::makeArrayRef(OuterTemplateParamLists,
@@ -7650,7 +7651,7 @@
                                                        TemplateArgs,
                                                        CanonType,
                                                        PrevPartial);
-    SetNestedNameSpecifier(Partial, SS);
+    SetNestedNameSpecifier(*this, Partial, SS);
     if (TemplateParameterLists.size() > 1 && SS.isSet()) {
       Partial->setTemplateParameterListsInfo(
           Context, TemplateParameterLists.drop_back(1));
@@ -7676,7 +7677,7 @@
                                                 ClassTemplate,
                                                 Converted,
                                                 PrevDecl);
-    SetNestedNameSpecifier(Specialization, SS);
+    SetNestedNameSpecifier(*this, Specialization, SS);
     if (TemplateParameterLists.size() > 0) {
       Specialization->setTemplateParameterListsInfo(Context,
                                                     TemplateParameterLists);
@@ -8775,7 +8776,7 @@
                                                 ClassTemplate,
                                                 Converted,
                                                 PrevDecl);
-    SetNestedNameSpecifier(Specialization, SS);
+    SetNestedNameSpecifier(*this, Specialization, SS);
 
     if (!HasNoEffect && !PrevDecl) {
       // Insert the new specialization.