[PATCH, AArch64] Fix the pointer-typed function argument expansion in aarch64_simd_expand_args

[Yufeng Zhang <Yufeng dot Zhang at arm dot com>]

This patch fixes a number of test failures in gcc.target/aarch64/v*.c in 
ILP32.

The corresponding RTL patterns for some load/store builtins have Pmode 
(i.e. DImode) specified for their address operands.  However, coming 
from a pointer-typed function argument, op[argc] will have SImode in 
ILP32.  Instead of duplicating these RTL patterns to cope with SImode 
operand (which e.g. would complicate arm_neon.h), we explicitly convert 
the operand to Pmode here; an address operand in a RTL shall have Pmode 
anyway.  Note that if op[argc] already has DImode, 
convert_memory_address will simply return it.

OK for the trunk?

Thanks,
Yufeng

gcc/

	* gimple-ssa-strength-reduction.c (backtrace_base_for_ref): Call
	get_unwidened and check 'base_in' again.

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