Update vector calling convention for AArch64.

bug 16846318

Change-Id: I3cfd167758b4bd634d8480ee6ba6bb55d61f82a7
Merge "Update vector calling convention for AArch64."
Disable FPIE just for Clang.

bug 15814177

Change-Id: Ib313eba4f4d3a552026617dfcc597840d2abe8ef
Merge "Disable FPIE just for Clang."