x86: Set dl_hwcap from CPU featureshjl/hwcap/master

On x86, the usage of AT_HWCAP in glibc is obsolete since addition of
dl_x86_cpu_features.  dl_hwcap, which was set from AT_HWCAP, is used by
dynamic linker to build an array of hardware capability names, which are
added to search path when loading shared object.  dl_hwcap was unused on
x86-64 and only SSE2 was used on i386.

This patch sets dl_hwcap with new hardware capabilities from CPU
features.  Currently, 2 capabilities, SSE2 and AVX2, are supported.
The maximum number of hardware capabilities is 64.  Since x86-64
includes SSE2, SSE2 is skipped on x86-64.  dl_x86_cap_flags is kepted
for i386 and is used by _dl_show_auxv.  dl_x86_hwcap_flags is added
for new hardware capabilities.

	* sysdeps/i386/dl-hwcap.h: New file.
	* sysdeps/x86/dl-hwcap.h: Likewise.
	* sysdeps/x86_64/dl-hwcap.h: Likewise.
	* sysdeps/x86_64/dl-procinfo.h: Likewise.
	* sysdeps/i386/dl-procinfo.c (_dl_x86_hwcap_flags): New.
	* sysdeps/i386/dl-procinfo.h: Include <dl-hwcap.h>.
	(_DL_HWCAP_COUNT): Removed.
	(HWCAP_I386_XXX): Likewise.
	(HWCAP_IMPORTANT): Likewise.
	(_dl_procinfo): Likewise.
	(_dl_hwcap_string): Likewise.
	(_dl_string_hwcap): Likewise.
	* sysdeps/unix/sysv/linux/i386/dl-procinfo.h (_dl_procinfo):
	Replace _DL_HWCAP_COUNT with 32.
	* sysdeps/unix/sysv/linux/x86_64/dl-procinfo.h [!IS_IN (ldconfig)]:
	Include <sysdeps/x86_64/dl-procinfo.h>.
	* sysdeps/x86/cpu-features.c: Include <dl-hwcap.h>.
	(init_cpu_features): Set dl_hwcap and dl_hwcap_mask.
	* sysdeps/x86_64/dl-procinfo.c (_dl_x86_hwcap_flags): New.

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