[clang] NFC: Remove CompilerInstance::getInvocationPtr

This member function was introduced in 0a92e09 ([clang][deps] Generate the full command-line for modules) in order to keep the CompilerInvocation object alive after CompilerInstance goes out of scope. However, d3fb4b9 ([clang][deps] NFC: Report modules' context hash) removes that use-case, making this function dead.

Author: jansvoboda11

clang/include/clang/Frontend/CompilerInstance.h

@@ -225,11 +225,9 @@ class CompilerInstance : public ModuleLoader {
 
   bool hasInvocation() const { return Invocation != nullptr; }
 
-  CompilerInvocation &getInvocation() { return *getInvocationPtr(); }
-
-  std::shared_ptr<CompilerInvocation> getInvocationPtr() {
+  CompilerInvocation &getInvocation() {
     assert(Invocation && "Compiler instance has no invocation!");
-    return Invocation;
+    return *Invocation;
   }
 
   /// setInvocation - Replace the current invocation.