eal/x86: fix clang build with -O0

eal/x86: fix clang build with -O0

Clang seems to have a bug with asm inside inline function rte_xabort():

rte_rtm.h:56:15: error: invalid operand for inline asm constraint 'i'
        asm volatile(".byte 0xc6,0xf8,%P0" :: "i" (status) : "memory");
                     ^

It is seen only when building with EXTRA_CFLAGS=-O0.

The workaround is to replace the inline function by a macro.

Fixes: ba7468997ea6 ("spinlock: add HTM lock elision for x86")

Signed-off-by: Damjan Marion <damarion@cisco.com>
Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>