[SYCL][NATIVECPU] Fix for mismatching debug format between host and device (#11337)

This PR fixes the SYCL toolchain to pass the debug format used for the
host compilation to the device compilation.
Without this patch mismatching debug formats could lead to corrupt debug
information and link errors.

Author: uwedolinsky

clang/lib/Driver/ToolChains/SYCL.h

@@ -185,6 +185,11 @@ class LLVM_LIBRARY_VISIBILITY SYCLToolChain : public ToolChain {
       return this->HostTC.isPICDefault();
     return false;
   }
+  llvm::codegenoptions::DebugInfoFormat getDefaultDebugFormat() const override {
+    if (this->IsSYCLNativeCPU)
+      return this->HostTC.getDefaultDebugFormat();
+    return ToolChain::getDefaultDebugFormat();
+  }
   bool isPIEDefault(const llvm::opt::ArgList &Args) const override {
     return false;
   }

clang/test/Driver/sycl-native-cpu.cpp

@@ -7,3 +7,13 @@
 
 // checks that the target triples are set correctly when the target is set explicitly
 // CHECK-AARCH64: clang{{.*}}"-triple" "aarch64-unknown-linux-gnu"{{.*}}"-aux-triple" "aarch64-unknown-linux-gnu"{{.*}}"-fsycl-is-native-cpu"{{.*}}"-D" "__SYCL_NATIVE_CPU__"
+
+// RUN:   %clang -### -target x86_64-unknown-linux-gnu -fsycl -fsycl-targets=native_cpu -g %s 2>&1 | FileCheck -check-prefix=CHECK-LINUX %s
+// CHECK-LINUX: {{.*}}"-fsycl-is-device"{{.*}}"-dwarf-version=[[DVERSION:.*]]" "-debugger-tuning=gdb"
+// CHECK-LINUX-DAG: {{.*}}"-fsycl-is-host"{{.*}}"-dwarf-version=[[DVERSION]]" "-debugger-tuning=gdb"
+// CHECK-LINUX-NOT: codeview
+
+// RUN:   %clang -### -target x86_64-windows-msvc -fsycl -fsycl-targets=native_cpu -g %s 2>&1 | FileCheck -check-prefix=CHECK-WIN %s
+// CHECK-WIN: {{.*}}"-fsycl-is-device"{{.*}}"-gcodeview"
+// CHECK-WIN-DAG: {{.*}}"-fsycl-is-host"{{.*}}"-gcodeview"
+// CHECK-WIN-NOT: dwarf