[compiler-rt] make mmap-munmap interceptor fail earlier (PR #169775)

[Thurston Dang via llvm-commits]

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@@ -47,6 +47,12 @@
 #    define ASAN_PTHREAD_CREATE_VERSION "GLIBC_2.2"
 #  endif
 
+#if !defined(MAP_FAILED)
+#  define MAP_FAILED ((void *)-1)
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thurstond wrote:

`map_fixed` (in lowercase) is defined in compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cpp for this purpose (example usage: compiler-rt/lib/hwasan/hwasan_interceptors.cpp).

https://github.com/llvm/llvm-project/pull/169775