[patch] Disable store merging in asan_expand_mark_ifn

[Eric Botcazou]

Hi,

asan_expand_mark_ifn does manual store merging but doesn't take into account 
the alignment, so this can break on strict-alignment platforms.

Tested on SPARC/Solaris 11, where this fixes this regression:

FAIL: gcc.dg/asan/use-after-scope-5.c   -O0  output pattern test
FAIL: gcc.dg/asan/use-after-scope-5.c   -O1  output pattern test
FAIL: gcc.dg/asan/use-after-scope-5.c   -O2  output pattern test
FAIL: gcc.dg/asan/use-after-scope-5.c   -O3 -fomit-frame-pointer -funroll-
loops -fpeel-loops -ftracer -finline-functions  output pattern test
FAIL: gcc.dg/asan/use-after-scope-5.c   -O3 -g  output pattern test
FAIL: gcc.dg/asan/use-after-scope-5.c   -Os  output pattern test
FAIL: gcc.dg/asan/use-after-scope-5.c   -O2 -flto -flto-partition=none  output 
pattern test
FAIL: gcc.dg/asan/use-after-scope-5.c   -O2 -flto  output pattern test

OK for mainline?


2019-02-11  Eric Botcazou  <ebotcazou@adacore.com>

	* asan.c (asan_expand_mark_ifn): Always use a size of 1 byte for the
 	stores on strict-alignment platforms.

-- 
Eric Botcazou
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