Revert of [fullcodegen] Remove the hacky %_FastOneByteArrayJoin intrinsic.

src/bailout-reason.h

Index: src/bailout-reason.h
diff --git a/src/bailout-reason.h b/src/bailout-reason.h
index d47a2d45760e2a7672d6e43b00870ee496fbc830..dc4186acdfb5af212c473813366314caed93c350 100644
--- a/src/bailout-reason.h
+++ b/src/bailout-reason.h
@@ -97,6 +97,8 @@
   V(kImportDeclaration, "Import declaration")                                  \
   V(kIndexIsNegative, "Index is negative")                                     \
   V(kIndexIsTooLarge, "Index is too large")                                    \
+  V(kInlinedRuntimeFunctionFastOneByteArrayJoin,                               \
+    "Inlined runtime function: FastOneByteArrayJoin")                          \
   V(kInliningBailedOut, "Inlining bailed out")                                 \
   V(kInputGPRIsExpectedToHaveUpper32Cleared,                                   \
     "Input GPR is expected to have upper32 cleared")                           \
@@ -127,6 +129,8 @@
   V(kNativeFunctionLiteral, "Native function literal")                         \
   V(kNeedSmiLiteral, "Need a Smi literal here")                                \
   V(kNoCasesLeft, "No cases left")                                             \
+  V(kNoEmptyArraysHereInEmitFastOneByteArrayJoin,                              \
+    "No empty arrays here in EmitFastOneByteArrayJoin")                        \
   V(kNonInitializerAssignmentToConst, "Non-initializer assignment to const")   \
   V(kNonSmiIndex, "Non-smi index")                                             \
   V(kNonSmiKeyInArrayLiteral, "Non-smi key in array literal")                  \