[nsan] Remove mallopt from nsan_interceptors (llvm#101055)

Fixes a build failure on 19.1.0-rc1 when building on linux with musl as
the libc

musl does not provide mallopt, whereas glibc does. mallopt has
portability issues with other libc implementations. Just remove the use.

Co-authored-by: Daniel Martinez <[email protected]>
(cherry picked from commit 2c3eb8d)

Author: 2 people

compiler-rt/lib/nsan/nsan_interceptors.cpp

@@ -21,10 +21,6 @@
 
 #include <wchar.h>
 
-#if SANITIZER_LINUX
-extern "C" int mallopt(int param, int value);
-#endif
-
 using namespace __sanitizer;
 using __nsan::nsan_init_is_running;
 using __nsan::nsan_initialized;
@@ -209,12 +205,6 @@ void __nsan::InitializeInterceptors() {
   static bool initialized = false;
   CHECK(!initialized);
 
-  // Instruct libc malloc to consume less memory.
-#if SANITIZER_LINUX
-  mallopt(1, 0);          // M_MXFAST
-  mallopt(-3, 32 * 1024); // M_MMAP_THRESHOLD
-#endif
-
   InitializeMallocInterceptors();
 
   INTERCEPT_FUNCTION(memset);