[NFC][Clang] Make GetSDLFromOffloadArchive and SDLSearch static (#70201)

Make GetSDLFromOffloadArchive and SDLSearch functions static since they
are used only in the file where they are defined. The aim is to ease
refactoring/modifying the declarations of these functions in the future.

clang/lib/Driver/ToolChains/CommonArgs.cpp

@@ -2051,7 +2051,7 @@ void tools::addX86AlignBranchArgs(const Driver &D, const ArgList &Args,
 /// convention has been to use the prefix “lib”. To avoid confusion with host
 /// archive libraries, we use prefix "libbc-" for the bitcode SDL archives.
 ///
-bool tools::SDLSearch(const Driver &D, const llvm::opt::ArgList &DriverArgs,
+static bool SDLSearch(const Driver &D, const llvm::opt::ArgList &DriverArgs,
                       llvm::opt::ArgStringList &CC1Args,
                       SmallVector<std::string, 8> LibraryPaths, std::string Lib,
                       StringRef Arch, StringRef Target, bool isBitCodeSDL) {
@@ -2128,7 +2128,7 @@ bool tools::SDLSearch(const Driver &D, const llvm::opt::ArgList &DriverArgs,
 /// the library paths. If so, add a new command to clang-offload-bundler to
 /// unbundle this archive and create a temporary device specific archive. Name
 /// of this SDL is passed to the llvm-link tool.
-bool tools::GetSDLFromOffloadArchive(
+static bool GetSDLFromOffloadArchive(
     Compilation &C, const Driver &D, const Tool &T, const JobAction &JA,
     const InputInfoList &Inputs, const llvm::opt::ArgList &DriverArgs,
     llvm::opt::ArgStringList &CC1Args, SmallVector<std::string, 8> LibraryPaths,

clang/lib/Driver/ToolChains/CommonArgs.h

@@ -66,19 +66,6 @@ void AddStaticDeviceLibs(Compilation *C, const Tool *T, const JobAction *JA,
                          llvm::opt::ArgStringList &CmdArgs, StringRef Arch,
                          StringRef Target, bool isBitCodeSDL);
 
-bool SDLSearch(const Driver &D, const llvm::opt::ArgList &DriverArgs,
-               llvm::opt::ArgStringList &CmdArgs,
-               SmallVector<std::string, 8> LibraryPaths, std::string Lib,
-               StringRef Arch, StringRef Target, bool isBitCodeSDL);
-
-bool GetSDLFromOffloadArchive(Compilation &C, const Driver &D, const Tool &T,
-                              const JobAction &JA, const InputInfoList &Inputs,
-                              const llvm::opt::ArgList &DriverArgs,
-                              llvm::opt::ArgStringList &CC1Args,
-                              SmallVector<std::string, 8> LibraryPaths,
-                              StringRef Lib, StringRef Arch, StringRef Target,
-                              bool isBitCodeSDL);
-
 const char *SplitDebugName(const JobAction &JA, const llvm::opt::ArgList &Args,
                            const InputInfo &Input, const InputInfo &Output);