libsanitizer merge from upstream r208536

[Maxim Ostapenko]

Hi,

I see a couple of errors when building for arm-linux-gnueabi (host is 
x86_64 Ubuntu 12.04 LTS, host compiler is gcc version 4.6.3 
(Ubuntu/Linaro 4.6.3-1ubuntu5)):

1)   In file included from 
/home/max/workspace/downloads/gcc/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc:164:0:
/home/max/workspace/downloads/gcc/libsanitizer/sanitizer_common/sanitizer_internal_defs.h:253:72: 
error: size of array 'assertion_failed__1128' is negative
      typedef char IMPL_PASTE(assertion_failed_##_, line)[2*(int)(pred)-1]
^
/home/max/workspace/downloads/gcc/libsanitizer/sanitizer_common/sanitizer_internal_defs.h:247:30: 
note: in expansion of macro 'IMPL_COMPILER_ASSERT'
  #define COMPILER_CHECK(pred) IMPL_COMPILER_ASSERT(pred, __LINE__)
                               ^
/home/max/workspace/downloads/gcc/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h:1249:3: 
note: in expansion of macro 'COMPILER_CHECK'
    COMPILER_CHECK(sizeof(__sanitizer_##TYPE) == sizeof(TYPE))
    ^
/home/max/workspace/downloads/gcc/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc:1128:1: 
note: in expansion of macro 'CHECK_TYPE_SIZE'
  CHECK_TYPE_SIZE(XDR::xdr_ops);
  ^
make[4]: *** [sanitizer_platform_limits_posix.lo] Error 1


2) 
/home/max/workspace/downloads/gcc/libsanitizer/sanitizer_common/sanitizer_atomic_clang_other.h:54:77: 
error: cast from type 'const volatile Type* {aka const volatile unsigned 
char*}' to type 'volatile Type* {aka volatile unsigned char*}' casts 
away qualifiers [-Werror=cast-qual]
      v = __sync_fetch_and_add((typename T::Type 
volatile*)&a->val_dont_use, 0);

Attached patch seems to help.

-Maxim
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