[fullcodegen] Remove the hacky %_FastOneByteArrayJoin intrinsic.

src/crankshaft/hydrogen.cc

Index: src/crankshaft/hydrogen.cc
diff --git a/src/crankshaft/hydrogen.cc b/src/crankshaft/hydrogen.cc
index 273ff52684d683191c87efded6b362a7ce840b99..d0e298c248702475b7abf28345293f707be793d8 100644
--- a/src/crankshaft/hydrogen.cc
+++ b/src/crankshaft/hydrogen.cc
@@ -12885,16 +12885,6 @@ void HOptimizedGraphBuilder::GenerateGetCachedArrayIndex(CallRuntime* call) {
 }
 
 
-void HOptimizedGraphBuilder::GenerateFastOneByteArrayJoin(CallRuntime* call) {
-  // Simply returning undefined here would be semantically correct and even
-  // avoid the bailout. Nevertheless, some ancient benchmarks like SunSpider's
-  // string-fasta would tank, because fullcode contains an optimized version.
-  // Obviously the fullcode => Crankshaft => bailout => fullcode dance is
-  // faster... *sigh*
-  return Bailout(kInlinedRuntimeFunctionFastOneByteArrayJoin);
-}
-
-
 void HOptimizedGraphBuilder::GenerateDebugBreakInOptimizedCode(
     CallRuntime* call) {
   Add<HDebugBreak>();