[tsan] Fix aarch64-*-linux after D86377

MaskRay · MaskRay · commit 5af991d46497 · 2021-03-10T22:16:04.000-08:00
All check-tsan tests fail on aarch64-*-linux because HeapMemEnd() &gt; ShadowBeg()
for the following code path:
```
 #if defined(__aarch64__) &amp;&amp; !HAS_48_BIT_ADDRESS_SPACE
   ProtectRange(HeapMemEnd(), ShadowBeg());
```

Restore the behavior before D86377 for aarch64-*-linux.
diff --git a/compiler-rt/lib/tsan/rtl/tsan_platform_posix.cpp b/compiler-rt/lib/tsan/rtl/tsan_platform_posix.cpp
@@ -99,7 +99,7 @@ void CheckAndProtect() {
     Die();
   }
 
-#if defined(__aarch64__) && !HAS_48_BIT_ADDRESS_SPACE
+#if defined(__aarch64__) && defined(__APPLE__) && !HAS_48_BIT_ADDRESS_SPACE
   ProtectRange(HeapMemEnd(), ShadowBeg());
   ProtectRange(ShadowEnd(), MetaShadowBeg());
   ProtectRange(MetaShadowEnd(), TraceMemBeg());

Original file line number	Diff line number	Diff line change
`@@ -99,7 +99,7 @@ void CheckAndProtect() {`
`99`	`99`	`Die();`
`100`	`100`	`}`
`101`	`101`
`102`		`-#if defined(__aarch64__) && !HAS_48_BIT_ADDRESS_SPACE`
	`102`	`+#if defined(__aarch64__) && defined(__APPLE__) && !HAS_48_BIT_ADDRESS_SPACE`
`103`	`103`	`ProtectRange(HeapMemEnd(), ShadowBeg());`
`104`	`104`	`ProtectRange(ShadowEnd(), MetaShadowBeg());`
`105`	`105`	`ProtectRange(MetaShadowEnd(), TraceMemBeg());`