Implemented aligning and poisoning global redzones

tests_lit/asan_tests/errors.ll

 ; Verify that ASan properly catches and reports bugs
 
 ; REQUIRES: no_minimal_build
 
 ; check with a one off the end local access
 ; RUN: llvm-as %s -o - | pnacl-freeze > %t.pexe && %S/../../pydir/szbuild.py \
 ; RUN:     --fsanitize-address --sz="-allow-externally-defined-symbols" \
 ; RUN:     %t.pexe -o %t && %t 2>&1 | FileCheck %s
 
 ; check with a many off the end local access
 ; RUN: llvm-as %s -o - | pnacl-freeze > %t.pexe && %S/../../pydir/szbuild.py \
 ; RUN:     --fsanitize-address --sz="-allow-externally-defined-symbols" \
 ; RUN:     %t.pexe -o %t && %t 1 2>&1 | FileCheck %s
 
 ; check with a one before the front local access
 ; RUN: llvm-as %s -o - | pnacl-freeze > %t.pexe && %S/../../pydir/szbuild.py \
 ; RUN:     --fsanitize-address --sz="-allow-externally-defined-symbols" \
 ; RUN:     %t.pexe -o %t && %t 1 2 2>&1 | FileCheck %s
 
 ; check with a one off the end global access
-; RUIN: llvm-as %s -o - | pnacl-freeze > %t.pexe && %S/../../pydir/szbuild.py \
-; RUIN:     --fsanitize-address --sz="-allow-externally-defined-symbols" \
-; RUIN:     %t.pexe -o %t && %t 1 2 3 2>&1 | FileCheck %s
+; RUN: llvm-as %s -o - | pnacl-freeze > %t.pexe && %S/../../pydir/szbuild.py \
+; RUN:     --fsanitize-address --sz="-allow-externally-defined-symbols" \
+; RUN:     %t.pexe -o %t && %t 1 2 3 2>&1 | FileCheck %s
 
 ; check with a many off the end global access
-; RUIN: llvm-as %s -o - | pnacl-freeze > %t.pexe && %S/../../pydir/szbuild.py \
-; RUIN:     --fsanitize-address --sz="-allow-externally-defined-symbols" \
-; RUIN:     %t.pexe -o %t && %t 1 2 3 4 2>&1 | FileCheck %s
+; RUN: llvm-as %s -o - | pnacl-freeze > %t.pexe && %S/../../pydir/szbuild.py \
+; RUN:     --fsanitize-address --sz="-allow-externally-defined-symbols" \
+; RUN:     %t.pexe -o %t && %t 1 2 3 4 2>&1 | FileCheck %s
 
 ; check with a one before the front global access
-; RUIN: llvm-as %s -o - | pnacl-freeze > %t.pexe && %S/../../pydir/szbuild.py \
-; RUIN:     --fsanitize-address --sz="-allow-externally-defined-symbols" \
-; RUIN:     %t.pexe -o %t && %t 1 2 3 4 5 2>&1 | FileCheck %s
+; RUN: llvm-as %s -o - | pnacl-freeze > %t.pexe && %S/../../pydir/szbuild.py \
+; RUN:     --fsanitize-address --sz="-allow-externally-defined-symbols" \
+; RUN:     %t.pexe -o %t && %t 1 2 3 4 5 2>&1 | FileCheck %s
 
 
 declare external void @exit(i32)
 
 ; A global array
 @array = internal constant [12 x i8] zeroinitializer
 
 define i32 @access(i32 %is_local_i, i32 %err) {
   ; get the base pointer to either the local or global array
   %local = alloca i8, i32 12, align 1
@@ skipping 17 matching lines @@
   ret i32 %result
 }
 
 ; use argc to determine which test routine to run
 define void @_start(i32 %arg) {
   %argcaddr = add i32 %arg, 8
   %argcptr = inttoptr i32 %argcaddr to i32*
   %argc = load i32, i32* %argcptr, align 1
   switch i32 %argc, label %error [i32 1, label %one_local
                                   i32 2, label %many_local
-                                  i32 3, label %neg_local]
+                                  i32 3, label %neg_local
+                                  i32 4, label %one_global
+                                  i32 5, label %many_global
+                                  i32 6, label %neg_global]
 one_local:
-  ; Access one past the end
-  %__0 = call i32 @access(i32 1, i32 0)
+  ; Access one past the end of a local
+  call i32 @access(i32 1, i32 0)
   br label %error
 many_local:
-  ; Access five past the end
-  %__1 = call i32 @access(i32 1, i32 4)
+  ; Access five past the end of a local
+  call i32 @access(i32 1, i32 4)
   br label %error
 neg_local:
-  ; Access one before the beginning
-  %__2 = call i32 @access(i32 1, i32 -1)
+  ; Access one before the beginning of a local
+  call i32 @access(i32 1, i32 -1)
+  br label %error
+one_global:
+  ; Access one past the end of a global
+  call i32 @access(i32 0, i32 0)
+  br label %error
+many_global:
+  ; Access five past the end of a global
+  call i32 @access(i32 0, i32 4)
+  br label %error
+neg_global:
+  ; Access one before the beginning of a global
+  call i32 @access(i32 0, i32 -1)
   br label %error
 error:
   call void @exit(i32 1)
   unreachable
 }
 
 ; CHECK: Illegal access of 4 bytes at