[PATCH] [asan] Check _LP64 in addition to __x86_64__

[H.J. Lu]

Hi,

When building asan for x32, I got

/export/gnu/import/git/gcc/libsanitizer/asan/asan_rtl.cc: In function
‘void __asan::AsanInitInternal()’:
/export/gnu/import/git/gcc/libsanitizer/asan/asan_rtl.cc:605:16:
warning: large integer implicitly truncated to unsigned type
[-Woverflow]
/export/gnu/import/git/gcc/libsanitizer/asan/asan_rtl.cc:606:16:
warning: large integer implicitly truncated to unsigned type
[-Woverflow]

This patch checks _LP64 in addition to __x86_64__.

-- 
H.J.
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