x86: Update memcpy/memset inline strategies for -mtune=generic

x86: Update memcpy/memset inline strategies for -mtune=generic

Update memcpy and memset inline strategies for -mtune=generic:

1. Don't align memory.
2. For known sizes, prefer vector loop, unroll loop with 4 moves or
   stores per iteration without aligning the loop, up to 256 bytes.
3. For unknown sizes, use memcpy/memset.
4. Since each loop iteration has 4 stores and 8 stores for zeroing with
   unroll loop may be needed, change CLEAR_RATIO to 10 so that zeroing
   up to 72 bytes are fully unrolled with 9 stores without SSE.

gcc/

	PR target/70308
	PR target/101366
	PR target/102294
	PR target/108585
	PR target/118276
	PR target/119596
	PR target/119703
	PR target/119704
	* config/i386/x86-tune-costs.h (generic_memcpy): Updated.
	(generic_memset): Likewise.
	(generic_cost): Change CLEAR_RATIO to 10.

gcc/testsuite/

	PR target/70308
	PR target/101366
	PR target/102294
	PR target/108585
	PR target/118276
	PR target/119596
	PR target/119703
	PR target/119704
	* g++.target/i386/memset-pr101366-1.C: New test.
	* g++.target/i386/memset-pr101366-2.C: Likewise.
	* g++.target/i386/memset-pr108585-1a.C: Likewise.
	* g++.target/i386/memset-pr108585-1b.C: Likewise.
	* g++.target/i386/memset-pr118276-1a.C: Likewise.
	* g++.target/i386/memset-pr118276-1b.C: Likewise.
	* g++.target/i386/memset-pr118276-1c.C: Likewise.
	* gcc.target/i386/memcpy-strategy-12.c: Likewise.
	* gcc.target/i386/memcpy-strategy-13.c: Likewise.
	* gcc.target/i386/memset-pr70308-1a.c: Likewise.
	* gcc.target/i386/memset-pr70308-1b.c: Likewise.
	* gcc.target/i386/memset-strategy-25.c: Likewise.
	* gcc.target/i386/memset-strategy-26.c: Likewise.
	* gcc.target/i386/memset-strategy-27.c: Likewise.
	* gcc.target/i386/memset-strategy-28.c: Likewise.
	* gcc.target/i386/memset-strategy-29.c: Likewise.
	* gcc.target/i386/memset-strategy-30.c: Likewise.
	* gcc.target/i386/memset-strategy-31.c: Likewise.
	* gcc.target/i386/auto-init-padding-3.c: Expect XMM stores.
	* gcc.target/i386/auto-init-padding-9.c: Likewise.
	* gcc.target/i386/mvc17.c: Fail with "rep mov"
	* gcc.target/i386/pr111657-1.c: Scan for unrolled loop.  Fail
	with "rep mov".
	* gcc.target/i386/shrink_wrap_1.c: Also pass
	-mmemset-strategy=rep_8byte:-1:align.
	* gcc.target/i386/sw-1.c: Also pass -mstringop-strategy=rep_byte.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>