Address the review comments.

Author: DanielCChen

clang/include/clang/Driver/Options.td

@@ -6881,10 +6881,10 @@ defm android_pad_segment : BooleanFFlag<"android-pad-segment">, Group<f_Group>;
 } // let Flags = [TargetSpecific]
 
 def shared_libflangrt : Flag<["-"], "shared-libflangrt">,
-  HelpText<"Dynamically link the shared flang-rt">, Group<Link_Group>,
+  HelpText<"Link the flang-rt shared library">, Group<Link_Group>,
   Visibility<[FlangOption]>, Flags<[NoArgumentUnused]>;
 def static_libflangrt : Flag<["-"], "static-libflangrt">, 
-  HelpText<"Statically link the static flang-rt">, Group<Link_Group>,
+  HelpText<"Link the flang-rt static library">, Group<Link_Group>,
   Visibility<[FlangOption]>, Flags<[NoArgumentUnused]>;
 
 //===----------------------------------------------------------------------===//

clang/lib/Driver/ToolChain.cpp

@@ -744,10 +744,12 @@ std::string ToolChain::buildCompilerRTBasename(const llvm::opt::ArgList &Args,
     Suffix = IsITANMSVCWindows ? ".lib" : ".a";
     break;
   case ToolChain::FT_Shared:
-    Suffix = TT.isOSWindows()
-                 ? (TT.isWindowsGNUEnvironment() ? ".dll.a" : ".lib")
-             : TT.isOSAIX() ? ".a"
-                            : ".so";
+    if (TT.isOSWindows())
+      Suffix = TT.isWindowsGNUEnvironment() ? ".dll.a" : ".lib";
+    else if (TT.isOSAIX())
+      Suffix = ".a";
+    else
+      Suffix = ".so";
     break;
   }