Revert "Move kVRegSize to globals.h to reduce include dependencies."

This reverts commit 5ae7cdfe5b8da645d1fec61c76176e6a37e78fb9.

Reason for revert: Unknown crash in linker

Change-Id: Ib5646376e2e589a7a6c4d66e72caa1f208a15905
diff --git a/runtime/stack_map.h b/runtime/stack_map.h
index 274e2b2..3839764 100644
--- a/runtime/stack_map.h
+++ b/runtime/stack_map.h
@@ -37,6 +37,9 @@
 // (signed) values.
 static constexpr ssize_t kFrameSlotSize = 4;
 
+// Size of Dex virtual registers.
+static constexpr size_t kVRegSize = 4;
+
 class ArtMethod;
 class CodeInfo;
 class StackMapEncoding;