[clang] Consistently use isOSSolaris()

While looking over the Solaris GNU ld patch (D85309
<https://reviews.llvm.org/D85309>), I noticed that we weren't using
`isOSSolaris()` consistenly in `clang`.  This patch fixes this.

Tested on `amd64-pc-solaris2.11`.

Differential Revision: https://reviews.llvm.org/D159222

Author: rorth

clang/lib/Basic/Targets/Sparc.cpp

@@ -141,7 +141,7 @@ void SparcTargetInfo::getTargetDefines(const LangOptions &Opts,
 void SparcV8TargetInfo::getTargetDefines(const LangOptions &Opts,
                                          MacroBuilder &Builder) const {
   SparcTargetInfo::getTargetDefines(Opts, Builder);
-  if (getTriple().getOS() == llvm::Triple::Solaris)
+  if (getTriple().isOSSolaris())
     Builder.defineMacro("__sparcv8");
   else {
     switch (getCPUGeneration(CPU)) {
@@ -168,7 +168,7 @@ void SparcV9TargetInfo::getTargetDefines(const LangOptions &Opts,
   Builder.defineMacro("__sparcv9");
   Builder.defineMacro("__arch64__");
   // Solaris doesn't need these variants, but the BSDs do.
-  if (getTriple().getOS() != llvm::Triple::Solaris) {
+  if (!getTriple().isOSSolaris()) {
     Builder.defineMacro("__sparc64__");
     Builder.defineMacro("__sparc_v9__");
     Builder.defineMacro("__sparcv9__");

clang/lib/Driver/ToolChains/CommonArgs.cpp

@@ -998,7 +998,7 @@ static bool addSanitizerDynamicList(const ToolChain &TC, const ArgList &Args,
 
   // Solaris ld defaults to --export-dynamic behaviour but doesn't support
   // the option, so don't try to pass it.
-  if (TC.getTriple().getOS() == llvm::Triple::Solaris && !LinkerIsGnuLd)
+  if (TC.getTriple().isOSSolaris() && !LinkerIsGnuLd)
     return true;
   SmallString<128> SanRT(TC.getCompilerRT(Args, Sanitizer));
   if (llvm::sys::fs::exists(SanRT + ".syms")) {

clang/lib/Driver/ToolChains/Gnu.cpp

@@ -1838,7 +1838,7 @@ static bool findBiarchMultilibs(const Driver &D,
 
   StringRef Suff64 = "/64";
   // Solaris uses platform-specific suffixes instead of /64.
-  if (TargetTriple.getOS() == llvm::Triple::Solaris) {
+  if (TargetTriple.isOSSolaris()) {
     switch (TargetTriple.getArch()) {
     case llvm::Triple::x86:
     case llvm::Triple::x86_64:
@@ -2220,7 +2220,7 @@ bool Generic_GCC::GCCInstallationDetector::getBiarchSibling(Multilib &M) const {
 void Generic_GCC::GCCInstallationDetector::AddDefaultGCCPrefixes(
     const llvm::Triple &TargetTriple, SmallVectorImpl<std::string> &Prefixes,
     StringRef SysRoot) {
-  if (TargetTriple.getOS() == llvm::Triple::Solaris) {
+  if (TargetTriple.isOSSolaris()) {
     // Solaris is a special case.
     // The GCC installation is under
     //   /usr/gcc/<major>.<minor>/lib/gcc/<triple>/<major>.<minor>.<patch>/
@@ -2422,7 +2422,7 @@ void Generic_GCC::GCCInstallationDetector::AddDefaultGCCPrefixes(
   using std::begin;
   using std::end;
 
-  if (TargetTriple.getOS() == llvm::Triple::Solaris) {
+  if (TargetTriple.isOSSolaris()) {
     static const char *const SolarisLibDirs[] = {"/lib"};
     static const char *const SolarisSparcV8Triples[] = {
         "sparc-sun-solaris2.11"};