[CodeGen] Consider MangleCtx when move lazy emission States

Also move MangleCtx when moving some lazy emission states in
CodeGenModule. Without this patch clang-repl hits an invalid address
access when passing `-Xcc -O2` flag.

Signed-off-by: Jun Zhang <jun@junz.org>

Differential Revision: https://reviews.llvm.org/D130420

clang/lib/CodeGen/CGCXXABI.h

@@ -41,6 +41,8 @@ struct CatchTypeInfo;
 
 /// Implements C++ ABI-specific code generation functions.
 class CGCXXABI {
+  friend class CodeGenModule;
+
 protected:
   CodeGenModule &CGM;
   std::unique_ptr<MangleContext> MangleCtx;

clang/lib/CodeGen/CodeGenModule.cpp

@@ -7000,4 +7000,6 @@ void CodeGenModule::moveLazyEmissionStates(CodeGenModule *NewBuilder) {
          "Still have (unmerged) EmittedDeferredDecls deferred decls");
 
   NewBuilder->EmittedDeferredDecls = std::move(EmittedDeferredDecls);
+
+  NewBuilder->ABI->MangleCtx = std::move(ABI->MangleCtx);
 }

clang/test/Interpreter/execute.cpp

@@ -5,6 +5,7 @@
 // UNSUPPORTED: system-aix
 // CHECK-DRIVER: i = 10
 // RUN: cat %s | clang-repl | FileCheck %s
+// RUN: cat %s | clang-repl -Xcc -O2 | FileCheck %s
 extern "C" int printf(const char *, ...);
 int i = 42;
 auto r1 = printf("i = %d\n", i);