Revert "Revert "64bit changes to the stack walker for the Quick ABI.""

This reverts commit 8d5ead52a92675c258113d3dfa71bf8fceba5d9f.

Change-Id: I6b4774a9bd180de33551975e106322ba1192e6ab
diff --git a/runtime/instruction_set.h b/runtime/instruction_set.h
index 4bc35a7..bfbbbd6 100644
--- a/runtime/instruction_set.h
+++ b/runtime/instruction_set.h
@@ -41,6 +41,8 @@
 size_t GetInstructionSetPointerSize(InstructionSet isa);
 size_t GetInstructionSetAlignment(InstructionSet isa);
 bool Is64BitInstructionSet(InstructionSet isa);
+size_t GetBytesPerGprSpillLocation(InstructionSet isa);
+size_t GetBytesPerFprSpillLocation(InstructionSet isa);
 
 #if defined(__arm__)
 static constexpr InstructionSet kRuntimeISA = kArm;