[clang][deps] Implement move-conversion for CowCompilerInvocation (llvm#66301)

jansvoboda11 · jansvoboda11 · commit df238ba93d3a · 2023-09-13T15:55:47.000-07:00
This avoids making copies at the end of
`makeCommonInvocationForModuleBuild()` (in `ModuleDepCollector.cpp`).
diff --git a/clang/include/clang/Frontend/CompilerInvocation.h b/clang/include/clang/Frontend/CompilerInvocation.h
@@ -400,6 +400,9 @@ class CowCompilerInvocation : public CompilerInvocationBase {
     deep_copy_assign(X);
   }
 
+  CowCompilerInvocation(CompilerInvocation &&X)
+      : CompilerInvocationBase(std::move(X)) {}
+
   // Const getters are inherited from the base class.
 
   /// Mutable getters.

Original file line number	Diff line number	Diff line change
`@@ -400,6 +400,9 @@ class CowCompilerInvocation : public CompilerInvocationBase {`
`400`	`400`	`deep_copy_assign(X);`
`401`	`401`	`}`
`402`	`402`
	`403`	`+ CowCompilerInvocation(CompilerInvocation &&X)`
	`404`	`+ : CompilerInvocationBase(std::move(X)) {}`
	`405`	`+`
`403`	`406`	`// Const getters are inherited from the base class.`
`404`	`407`
`405`	`408`	`/// Mutable getters.`