[compiler-rt] Set asan win 64-bits to use dynamic address for memory …

…allocator

Summary:
ASAN on Windows 64-bits should use a dynamic address instead of a fixed one.
The asan-allocator code to support dynamic address is already landed.
This patch is turning on the feature.

Reviewers: rnk

Subscribers: kubabrecka, dberris, llvm-commits, chrisha

Differential Revision: https://reviews.llvm.org/D24575

llvm-svn: 281522

compiler-rt/lib/asan/asan_allocator.h

@@ -130,6 +130,10 @@ typedef VeryCompactSizeClassMap SizeClassMap;
 const uptr kAllocatorSpace =  0x10000000000ULL;
 const uptr kAllocatorSize  =  0x10000000000ULL;  // 3T.
 typedef DefaultSizeClassMap SizeClassMap;
+# elif SANITIZER_WINDOWS
+const uptr kAllocatorSpace = ~(uptr)0;
+const uptr kAllocatorSize  =  0x8000000000ULL;  // 500G
+typedef DefaultSizeClassMap SizeClassMap;
 # else
 const uptr kAllocatorSpace = 0x600000000000ULL;
 const uptr kAllocatorSize  =  0x40000000000ULL;  // 4T.