[PS4][Driver] Only pass -lto-debug-options to linker when necessary (#101202)

The PS4 linker doesn't accept an empty LTO options string. Passing
nothing is also consistent with other drivers.

SIE tracker: TOOLCHAIN-16575

Author: playstation-edd

clang/lib/Driver/ToolChains/PS4CPU.cpp

@@ -177,7 +177,9 @@ void tools::PS4cpu::Linker::ConstructJob(Compilation &C, const JobAction &JA,
   if (StringRef Threads = getLTOParallelism(Args, D); !Threads.empty())
     AddLTOFlag(Twine("-threads=") + Threads);
 
-  CmdArgs.push_back(Args.MakeArgString(Twine("-lto-debug-options=") + LTOArgs));
+  if (*LTOArgs)
+    CmdArgs.push_back(
+        Args.MakeArgString(Twine("-lto-debug-options=") + LTOArgs));
 
   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs))
     TC.addSanitizerArgs(Args, CmdArgs, "-l", "");

clang/test/Driver/ps4-linker.c

@@ -16,3 +16,8 @@
 // RUN: %clang --target=x86_64-scei-ps4 -flto=full -fcrash-diagnostics-dir=mydumps %s -### 2>&1 | FileCheck --check-prefixes=CHECK-DIAG-LTO %s
 
 // CHECK-DIAG-LTO: "-lto-debug-options= -crash-diagnostics-dir=mydumps"
+
+// Test that -lto-debug-options is only supplied to the linker when necessary
+
+// RUN: %clang --target=x86_64-scei-ps4 %s -### 2>&1 | FileCheck --check-prefixes=CHECK-NO-LTO %s
+// CHECK-NO-LTO-NOT: -lto-debug-options