[clang][LTO] Remove the use of -- for arange option

https://reviews.llvm.org/D134668 removed all `--` (double dashes) when using `plugin-opt` to pass linker options and replaced them with `-`. https://reviews.llvm.org/D133092 was committed later but introduced an instance of `--`. This patch replaces the `--` with `-`.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D135400

Author: qiongsiwu

clang/lib/Driver/ToolChains/CommonArgs.cpp

@@ -514,7 +514,7 @@ void tools::addLTOOptions(const ToolChain &ToolChain, const ArgList &Args,
   // the way out.
   if (Args.hasArg(options::OPT_gdwarf_aranges)) {
     CmdArgs.push_back(
-        Args.MakeArgString("--plugin-opt=-generate-arange-section"));
+        Args.MakeArgString("-plugin-opt=-generate-arange-section"));
   }
 
   // Try to pass driver level flags relevant to LTO code generation down to

clang/test/Driver/debug-options-aranges.c

@@ -3,4 +3,4 @@
 /// Check that the linker plugin will get -generate-arange-section.
 // RUN: %clang -### -g --target=x86_64-linux -flto      -gdwarf-aranges %s 2>&1 | FileCheck %s
 // RUN: %clang -### -g --target=x86_64-linux -flto=thin -gdwarf-aranges %s 2>&1 | FileCheck %s
-// CHECK: --plugin-opt=-generate-arange-section
+// CHECK: "-plugin-opt=-generate-arange-section"