Revert of [es2015] Precompute the descriptive string for symbols.

src/builtins/mips/builtins-mips.cc

Index: src/builtins/mips/builtins-mips.cc
diff --git a/src/builtins/mips/builtins-mips.cc b/src/builtins/mips/builtins-mips.cc
index dd19b2383cf0a41caedc90224aecd0944fdc6109..24fe271cb346d02bb131e52d391a5456c5ed8c75 100644
--- a/src/builtins/mips/builtins-mips.cc
+++ b/src/builtins/mips/builtins-mips.cc
@@ -298,8 +298,12 @@
 
   // 3b. Convert symbol in a0 to a string.
   __ bind(&symbol_descriptive_string);
-  __ lw(v0, FieldMemOperand(a0, Symbol::kDescriptiveStringOffset));
-  // Fall through.
+  {
+    __ Lsa(sp, sp, t0, kPointerSizeLog2);
+    __ Drop(1);
+    __ Push(a0);
+    __ TailCallRuntime(Runtime::kSymbolDescriptiveString);
+  }
 
   __ bind(&drop_frame_and_ret);
   {