[msan] Nit: use init_origins parameter instead of __msan_get_track_origins() in InitShadowWithReExec (#86994)

This fixes a nit I had accidentally introduced in
#85142

I don't think the value of __msan_get_track_origins() will change
between the start and end of InitShadowWithReExec, but it's cleaner to
use the parameter.

Author: thurstond

compiler-rt/lib/msan/msan_linux.cpp

@@ -175,7 +175,7 @@ bool InitShadowWithReExec(bool init_origins) {
   // Start with dry run: check layout is ok, but don't print warnings because
   // warning messages will cause tests to fail (even if we successfully re-exec
   // after the warning).
-  bool success = InitShadow(__msan_get_track_origins(), true);
+  bool success = InitShadow(init_origins, true);
   if (!success) {
 #  if SANITIZER_LINUX
     // Perhaps ASLR entropy is too high. If ASLR is enabled, re-exec without it.
@@ -197,7 +197,7 @@ bool InitShadowWithReExec(bool init_origins) {
 
   // The earlier dry run didn't actually map or protect anything. Run again in
   // non-dry run mode.
-  return success && InitShadow(__msan_get_track_origins(), false);
+  return success && InitShadow(init_origins, false);
 }
 
 static void MsanAtExit(void) {