The hash field is supposed to be 4 bytes even in 64-bit. But the
default parameter of StoreObjectFieldNoWriteBarrier using kTagged
will generate 64-bit store. Fix by Replacing kTagged with kWord32.

This causes ~200 test failures on big-endian, because hash field
offset in BE is 12 instead of 8 in LE platforms.

R=bmeurer@chromium.org, epertoso@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com, bjaideep@ca.ibm.com
BUG=

Review-Url: https://codereview.chromium.org/2095003003
Cr-Commit-Position: refs/heads/master@{#37256}