VM: Use object pool for loading Symbols::PredefinedAddress in intrinsic code.

runtime/vm/intrinsifier_mips.cc

Index: runtime/vm/intrinsifier_mips.cc
diff --git a/runtime/vm/intrinsifier_mips.cc b/runtime/vm/intrinsifier_mips.cc
index 71f0ab653088208c0c216eceab9c1edd4c532795..9f33f0580c5abd0cd61974ccaade25531cdcd335 100644
--- a/runtime/vm/intrinsifier_mips.cc
+++ b/runtime/vm/intrinsifier_mips.cc
@@ -1767,8 +1767,16 @@ void Intrinsifier::StringBaseCharAt(Assembler* assembler) {
   __ lbu(T2, FieldAddress(T2, OneByteString::data_offset()));
   __ BranchUnsignedGreaterEqual(
       T2, Immediate(Symbols::kNumberOfOneCharCodeSymbols), &fall_through);
-  __ LoadImmediate(
-      V0, reinterpret_cast<uword>(Symbols::PredefinedAddress()));
+  const ExternalLabel symbols_label(
+      reinterpret_cast<uword>(Symbols::PredefinedAddress()));
+  __ Push(PP);
+  __ Push(RA);
+  __ LoadPoolPointer();
+  assembler->set_constant_pool_allowed(true);
+  __ LoadExternalLabel(V0, &symbols_label, kNotPatchable);
+  assembler->set_constant_pool_allowed(false);
+  __ Pop(RA);
+  __ Pop(PP);
   __ AddImmediate(V0, Symbols::kNullCharCodeSymbolOffset * kWordSize);
   __ sll(T2, T2, 2);
   __ addu(T2, T2, V0);
@@ -1782,8 +1790,14 @@ void Intrinsifier::StringBaseCharAt(Assembler* assembler) {
   __ lhu(T2, FieldAddress(T2, TwoByteString::data_offset()));
   __ BranchUnsignedGreaterEqual(
       T2, Immediate(Symbols::kNumberOfOneCharCodeSymbols), &fall_through);
-  __ LoadImmediate(V0,
-                   reinterpret_cast<uword>(Symbols::PredefinedAddress()));
+  __ Push(PP);
+  __ Push(RA);
+  __ LoadPoolPointer();
+  assembler->set_constant_pool_allowed(true);
+  __ LoadExternalLabel(V0, &symbols_label, kNotPatchable);
+  assembler->set_constant_pool_allowed(false);
+  __ Pop(RA);
+  __ Pop(PP);
   __ AddImmediate(V0, Symbols::kNullCharCodeSymbolOffset * kWordSize);
   __ sll(T2, T2, 2);
   __ addu(T2, T2, V0);