Subzero: Implemented codegen for poisoning and unpoisoning stack redzones

tests_lit/asan_tests/blacklist.ll

Index: tests_lit/asan_tests/blacklist.ll
diff --git a/tests_lit/asan_tests/blacklist.ll b/tests_lit/asan_tests/blacklist.ll
index c988a2cb4e465ddb8bb821fd734f2f38099f9780..1281721ce50166839b856d64302f533121bfb0c1 100644
--- a/tests_lit/asan_tests/blacklist.ll
+++ b/tests_lit/asan_tests/blacklist.ll
@@ -36,14 +36,20 @@ define internal void @func() {
 ; DUMP-LABEL: ================ Instrumented CFG ================
 ; DUMP-NEXT: define internal void @func() {
 ; DUMP-NEXT: __0:
+; DUMP-NEXT:   %__$rz0 = alloca i8, i32 32, align 8
 ; DUMP-NEXT:   %local = alloca i8, i32 64, align 8
-; DUMP-NEXT:   %__$rz1 = alloca i8, i32 32, align 8
-; DUMP-NEXT:   call void @__asan_poison(i32 %__$rz1, i32 32, i32 -1)
-; DUMP-NEXT:   %__$rz0 = add i32 %local, 4
-; DUMP-NEXT:   call void @__asan_poison(i32 %__$rz0, i32 60, i32 -1)
+; DUMP-NEXT:   %shadowIndex = lshr i32 %__$rz0, 3
+; DUMP-NEXT:   %firstShadowLoc = add i32 %shadowIndex, 536870912
+; DUMP-NEXT:   %__5 = add i32 %firstShadowLoc, 0
+; DUMP-NEXT:   store i32 -1, i32* %__5, align 1
+; DUMP-NEXT:   %__6 = add i32 %firstShadowLoc, 4
+; DUMP-NEXT:   store i32 -252, i32* %__6, align 1
+; DUMP-NEXT:   %__7 = add i32 %firstShadowLoc, 8
+; DUMP-NEXT:   store i32 -1, i32* %__7, align 1
 ; DUMP-NEXT:   %heapvar = call i32 @__asan_malloc(i32 42)
 ; DUMP-NEXT:   call void @__asan_free(i32 %heapvar)
-; DUMP-NEXT:   call void @__asan_unpoison(i32 %__$rz0, i32 60)
-; DUMP-NEXT:   call void @__asan_unpoison(i32 %__$rz1, i32 32)
+; DUMP-NEXT:   store i32 0, i32* %__5, align 1
+; DUMP-NEXT:   store i32 0, i32* %__6, align 1
+; DUMP-NEXT:   store i32 0, i32* %__7, align 1
 ; DUMP-NEXT:   ret void
 ; DUMP-NEXT: }