[arm64] Fix the GetStackPointer stub to return the C stack pointer.

runtime/vm/stub_code_ia32.cc

Index: runtime/vm/stub_code_ia32.cc
diff --git a/runtime/vm/stub_code_ia32.cc b/runtime/vm/stub_code_ia32.cc
index 8eb2798e3435dd1c4615f7f4f6aec8c54ddba762..3a40d1e1e65bf2f8130c0c3c40c96eedcfbdbb35 100644
--- a/runtime/vm/stub_code_ia32.cc
+++ b/runtime/vm/stub_code_ia32.cc
@@ -1830,7 +1830,7 @@ void StubCode::GenerateSubtype4TestCacheStub(Assembler* assembler) {
 // Return the current stack pointer address, used to do stack alignment checks.
 // TOS + 0: return address
 // Result in EAX.
-void StubCode::GenerateGetStackPointerStub(Assembler* assembler) {
+void StubCode::GenerateGetCStackPointerStub(Assembler* assembler) {
   __ leal(EAX, Address(ESP, kWordSize));
   __ ret();
 }