BaseTools: Fix IA32 UINT64 alignment for CLANG toolchains

BaseTools: Fix IA32 UINT64 alignment for CLANG toolchains

Currently, UINT64 is not 8-byte aligned for CLANG* toolchains on IA32,
which causes ABI differences between IA32 and X64 in such simple examples as:

struct S {UINT32 A; UINT64 B;};

Pass -malign-double to align it to 8 bytes, as is done for GCC already.

Signed-off-by: Pedro Falcato <pedro.falcato@gmail.com>
Cc: Marvin H?user <mhaeuser@posteo.de>
Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Yuwei Chen <yuwei.chen@intel.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>