stdint types all the way!

Change-Id: I4e4ef3a2002fc59ebd9097087f150eaf3f2a7e08
diff --git a/runtime/globals.h b/runtime/globals.h
index 107e064..b7bd44d 100644
--- a/runtime/globals.h
+++ b/runtime/globals.h
@@ -24,22 +24,14 @@
 
 namespace art {
 
-typedef uint8_t byte;
-typedef intptr_t word;
-typedef uintptr_t uword;
-
 static constexpr size_t KB = 1024;
 static constexpr size_t MB = KB * KB;
 static constexpr size_t GB = KB * KB * KB;
 
 // Runtime sizes.
-static constexpr size_t kWordSize = sizeof(word);
-static constexpr size_t kPointerSize = sizeof(void*);
-
 static constexpr size_t kBitsPerByte = 8;
 static constexpr size_t kBitsPerByteLog2 = 3;
-static constexpr int kBitsPerWord = kWordSize * kBitsPerByte;
-static constexpr size_t kWordHighBitMask = static_cast<size_t>(1) << (kBitsPerWord - 1);
+static constexpr int kBitsPerIntPtrT = sizeof(intptr_t) * kBitsPerByte;
 
 // Required stack alignment
 static constexpr size_t kStackAlignment = 16;