Add TargetRegistry::lookupTarget.

- This is a simplified mechanism which just looks up a target based on the
   target triple, with a few additional flags.

 - Remove getClosestStaticTargetForModule, the moral equivalent is now:
     lookupTarget(Mod->getTargetTriple, true, false, ...);

 - This no longer does the fuzzy matching with target data (based on endianness
   and pointer width) that getClosestStaticTargetForModule was doing, but this
   was deemed unnecessary.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77111 91177308-0d34-0410-b5e6-96231b3b80d8

tools/lto/LTOCodeGenerator.cpp

@@ -330,8 +330,10 @@ bool LTOCodeGenerator::determineTarget(std::string& errMsg)
         // create target machine from info for merged modules
         Module* mergedModule = _linker.getModule();
         const Target *march = 
-          TargetRegistry::getClosestStaticTargetForModule(*mergedModule, 
-                                                          errMsg);
+          TargetRegistry::lookupTarget(mergedModule->getTargetTriple(), 
+                                       /*FallbackToHost=*/true,
+                                       /*RequireJIT=*/false,
+                                       errMsg);
         if ( march == NULL )
             return true;