Add warn_unused_result for malloc-like functions (PR tree-optimization/78902).

Add warn_unused_result for malloc-like functions (PR tree-optimization/78902).

2019-06-07  Martin Liska  <mliska@suse.cz>

	PR tree-optimization/78902
	* builtin-attrs.def (ATTR_WARN_UNUSED_RESULT): New.
	(ATTR_MALLOC_NOTHROW_LEAF_LIST): Remove.
	(ATTR_WARN_UNUSED_RESULT_NOTHROW_LEAF_LIST): New.
	(ATTR_MALLOC_WARN_UNUSED_RESULT_NOTHROW_LEAF_LIST): New.
	(ATTR_ALLOC_SIZE_2_NOTHROW_LIST): Remove.
	(ATTR_MALLOC_SIZE_1_NOTHROW_LEAF_LIST): Remove.
	(ATTR_MALLOC_WARN_UNUSED_RESULT_NOTHROW_LIST): New.
	(ATTR_ALLOC_WARN_UNUSED_RESULT_SIZE_2_NOTHROW_LIST): New.
	(ATTR_MALLOC_WARN_UNUSED_RESULT_SIZE_1_NOTHROW_LEAF_LIST): New.
	(ATTR_ALLOCA_SIZE_1_NOTHROW_LEAF_LIST): Remove.
	(ATTR_ALLOCA_WARN_UNUSED_RESULT_SIZE_1_NOTHROW_LEAF_LIST): New.
	(ATTR_MALLOC_SIZE_1_2_NOTHROW_LEAF_LIST):  Remove.
	(ATTR_MALLOC_WARN_UNUSED_RESULT_SIZE_1_2_NOTHROW_LEAF_LIST):
	New.
	(ATTR_ALLOC_SIZE_2_NOTHROW_LEAF_LIST): Remove.
	(ATTR_ALLOC_WARN_UNUSED_RESULT_SIZE_2_NOTHROW_LEAF_LIST): New.
	(ATTR_MALLOC_NOTHROW_NONNULL): Remove.
	(ATTR_WARN_UNUSED_RESULT_NOTHROW_NONNULL): New.
	(ATTR_MALLOC_WARN_UNUSED_RESULT_NOTHROW_NONNULL): New.
	(ATTR_MALLOC_NOTHROW_NONNULL_LEAF): Remove.
	(ATTR_WARN_UNUSED_RESULT_NOTHROW_NONNULL_LEAF): New.
	(ATTR_MALLOC_WARN_UNUSED_RESULT_NOTHROW_NONNULL_LEAF): New.
	* builtins.def (BUILT_IN_ALIGNED_ALLOC): Change to use
	warn_unused_result attribute.
	(BUILT_IN_STRDUP): Likewise.
	(BUILT_IN_STRNDUP): Likewise.
	(BUILT_IN_ALLOCA): Likewise.
	(BUILT_IN_CALLOC): Likewise.
	(BUILT_IN_MALLOC): Likewise.
	(BUILT_IN_REALLOC): Likewise.
2019-06-07  Martin Liska  <mliska@suse.cz>

	PR tree-optimization/78902
	* c-c++-common/asan/alloca_loop_unpoisoning.c: Use result
	of __builtin_alloca.
	* c-c++-common/asan/pr88619.c: Likewise.
	* g++.dg/overload/using2.C: Likewise for malloc.
	* gcc.dg/attr-alloc_size-5.c: Add new dg-warning.
	* gcc.dg/nonnull-3.c: Use result of __builtin_strdup.
	* gcc.dg/pr43643.c: Likewise.
	* gcc.dg/pr59717.c: Likewise for calloc.
	* gcc.dg/torture/pr71816.c: Likewise.
	* gcc.dg/tree-ssa/pr78886.c: Likewise.
	* gcc.dg/tree-ssa/pr79697.c: Likewise.
	* gcc.dg/pr78902.c: New test.

From-SVN: r272028