[Driver] Remove references to Solaris 12

[ro]

Summary

Solaris 12 was re-christened as Solaris 11.4 while still in beta, so all references are long obsolete and can be removed.

Tested on amd64-pc-solaris2.11.

[MaskRay]

While you are modifying the lines static const char ...[] should look better than static const char *const SolarisX86Triples[]

[ro]

In D156861#4555280, @MaskRay wrote:

While you are modifying the lines static const char ...[] should look better than static const char *const SolarisX86Triples[]

While this would certainly avoid the ugly formatting, it doesn't compile. Besides, I'd rather avoid using different styles just a few lines apart.

clang/lib/Driver/ToolChains/Gnu.cpp

/*static*/ void Generic_GCC::GCCInstallationDetector::CollectLibDirsAndTriples(
 
 
   using std::begin;
   using std::end;
 
   if (TargetTriple.getOS() == llvm::Triple::Solaris) {
     static const char *const SolarisLibDirs[] = {"/lib"};
     static const char *const SolarisSparcV8Triples[] = {
-        "sparc-sun-solaris2.11", "sparc-sun-solaris2.12"};
+        "sparc-sun-solaris2.11"};
     static const char *const SolarisSparcV9Triples[] = {
-        "sparcv9-sun-solaris2.11", "sparcv9-sun-solaris2.12"};
-    static const char *const SolarisX86Triples[] = {"i386-pc-solaris2.11",
-                                                    "i386-pc-solaris2.12"};
-    static const char *const SolarisX86_64Triples[] = {"x86_64-pc-solaris2.11",
-                                                       "x86_64-pc-solaris2.12"};
+        "sparcv9-sun-solaris2.11"};
+    static const char *const SolarisX86Triples[] = {"i386-pc-solaris2.11"};
+    static const char *const SolarisX86_64Triples[] = {"x86_64-pc-solaris2.11"};
     LibDirs.append(begin(SolarisLibDirs), end(SolarisLibDirs));
     BiarchLibDirs.append(begin(SolarisLibDirs), end(SolarisLibDirs));
     switch (TargetTriple.getArch()) {
     case llvm::Triple::x86:
       TripleAliases.append(begin(SolarisX86Triples), end(SolarisX86Triples));
       BiarchTripleAliases.append(begin(SolarisX86_64Triples),
                                  end(SolarisX86_64Triples));
       break;