[PATCH 7/7] Libsanitizer merge from upstream r249633.

[Maxim Ostapenko]

This is the final patch. Force libsanitizer to use an old ABI for ubsan 
float cast data descriptors, because for some exprs (e.g. that type of 
tcc_declaration) we can't get the right location for now. I'm not sure 
about this, perhaps it should be fixed in GCC somehow.
2015-10-13  Maxim Ostapenko  <m.ostape...@partner.samsung.com>

	* ubsan/ubsan_handlers.cc (looksLikeFloatCastOverflowDataV1): Always
	return true for now.
Index: libsanitizer/ubsan/ubsan_handlers.cc
===================================================================
--- libsanitizer/ubsan/ubsan_handlers.cc	(revision 250059)
+++ libsanitizer/ubsan/ubsan_handlers.cc	(working copy)
@@ -307,6 +307,9 @@
 }
 
 static bool looksLikeFloatCastOverflowDataV1(void *Data) {
+  // (TODO): propagate SourceLocation into DataDescriptor and use this
+  // heuristic than.
+  return true;
   // First field is either a pointer to filename or a pointer to a
   // TypeDescriptor.
   u8 *FilenameOrTypeDescriptor;