[MIPS] Fix a problem with the FPU double alignment workaround.

This patch fixes the following cts failure:
tests.api.java.lang.reflect.MethodTest#test_invokeLjava_lang_Object$Ljava_lang_Object

Signed-off-by: Douglas Leung <douglas@mips.com>

(cherry picked from commit 1929a9380056b68119e938109f97bb630de11c72)

Change-Id: If4b711638c0f5338f55e3ac2f38c2acbe12cdd30
Merge "[MIPS] Fix a problem with the FPU double alignment workaround." into dev-mips-jb-mr1