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

runtime/vm/intrinsifier_arm.cc

Index: runtime/vm/intrinsifier_arm.cc
diff --git a/runtime/vm/intrinsifier_arm.cc b/runtime/vm/intrinsifier_arm.cc
index 4cd8e6a66abef9013df761e959c0e09beb7f1ab9..702ed7f859bd8fbd44e56a1a8179cdfab78d5fc2 100644
--- a/runtime/vm/intrinsifier_arm.cc
+++ b/runtime/vm/intrinsifier_arm.cc
@@ -1661,8 +1661,14 @@ void Intrinsifier::StringBaseCharAt(Assembler* assembler) {
   __ ldrb(R1, Address(R0, R1));
   __ CompareImmediate(R1, Symbols::kNumberOfOneCharCodeSymbols);
   __ b(&fall_through, GE);
-  __ LoadImmediate(R0,
-                   reinterpret_cast<uword>(Symbols::PredefinedAddress()));
+  const ExternalLabel symbols_label(
+      reinterpret_cast<uword>(Symbols::PredefinedAddress()));
+  __ Push(PP);
+  __ LoadPoolPointer();
+  assembler->set_constant_pool_allowed(true);
+  __ LoadExternalLabel(R0, &symbols_label, kNotPatchable);
+  assembler->set_constant_pool_allowed(false);
+  __ Pop(PP);
   __ AddImmediate(R0, Symbols::kNullCharCodeSymbolOffset * kWordSize);
   __ ldr(R0, Address(R0, R1, LSL, 2));
   __ Ret();
@@ -1675,8 +1681,12 @@ void Intrinsifier::StringBaseCharAt(Assembler* assembler) {
   __ ldrh(R1, Address(R0, R1));
   __ CompareImmediate(R1, Symbols::kNumberOfOneCharCodeSymbols);
   __ b(&fall_through, GE);
-  __ LoadImmediate(R0,
-                   reinterpret_cast<uword>(Symbols::PredefinedAddress()));
+  __ Push(PP);
+  __ LoadPoolPointer();
+  assembler->set_constant_pool_allowed(true);
+  __ LoadExternalLabel(R0, &symbols_label, kNotPatchable);
+  assembler->set_constant_pool_allowed(false);
+  __ Pop(PP);
   __ AddImmediate(R0, Symbols::kNullCharCodeSymbolOffset * kWordSize);
   __ ldr(R0, Address(R0, R1, LSL, 2));
   __ Ret();