Revert "Optimize IMT"

Bug: 29188168 (for initial CL)
Bug: 29778499 (reason for revert)

This reverts commit badee9820fcf5dca5f8c46c3215ae1779ee7736e.

Change-Id: I32b8463122c3521e233c34ca95c96a5078e88848
diff --git a/runtime/image.cc b/runtime/image.cc
index 2362a92..a9552c2 100644
--- a/runtime/image.cc
+++ b/runtime/image.cc
@@ -24,7 +24,7 @@
 namespace art {
 
 const uint8_t ImageHeader::kImageMagic[] = { 'a', 'r', 't', '\n' };
-const uint8_t ImageHeader::kImageVersion[] = { '0', '3', '0', '\0' };
+const uint8_t ImageHeader::kImageVersion[] = { '0', '2', '9', '\0' };
 
 ImageHeader::ImageHeader(uint32_t image_begin,
                          uint32_t image_size,