[Diagnostics] Free memory associated with printed string

Author: DougGregor

lib/ASTGen/Sources/ASTGen/Diagnostics.swift

@@ -444,7 +444,7 @@ public func addQueuedDiagnostic(
 
 /// Render the queued diagnostics into a UTF-8 string.
 @_cdecl("swift_ASTGen_renderQueuedDiagnostics")
-public func renterQueuedDiagnostics(
+public func renderQueuedDiagnostics(
   queuedDiagnosticsPtr: UnsafeMutablePointer<UInt8>,
   contextSize: Int,
   colorize: Int,

lib/Frontend/PrintingDiagnosticConsumer.cpp

@@ -54,6 +54,7 @@ extern "C" void swift_ASTGen_addQueuedDiagnostic(
 extern "C" void swift_ASTGen_renderQueuedDiagnostics(
     void *queued, ptrdiff_t contextSize, ptrdiff_t colorize,
     char **outBuffer, ptrdiff_t *outBufferLength);
+extern "C" void swift_ASTGen_freeString(const char *str);
 
 // FIXME: Hack because we cannot easily get to the already-parsed source
 // file from here. Fix this egregious oversight!
@@ -1198,6 +1199,7 @@ void PrintingDiagnosticConsumer::flush(bool includeTrailingBreak) {
         &renderedString, &renderedStringLen);
     if (renderedString) {
       Stream.write(renderedString, renderedStringLen);
+      swift_ASTGen_freeString(renderedString);
     }
     swift_ASTGen_destroyQueuedDiagnostics(queuedDiagnostics);
     queuedDiagnostics = nullptr;