[PATCH] PR23230 Fix asan strtol_strict/strtoll_strict tests

[Kostya Serebryany]

================
Comment at: test/asan/TestCases/strtol_strict.c:45
@@ +44,3 @@
+void __attribute__((no_sanitize_address)) underflow_write(char *array) {
+  array[-1] = '\0';
+}
----------------
ouch. This is going to corrupt asan's heap internals and may cause other kinds of flakiness in the test. 
I would suggest to allocate a larger buffer, write 0 to the first 8 bytes,  apply __asan_poison_memory to those first 8 bytes, 
and then pass pass the address to one of those 8 bytes to strtol. 
This way you will get a reliable test.

http://reviews.llvm.org/D10063

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